diff --git a/lib/Alchemy/Phrasea/Collection/CachedCollectionRepository.php b/lib/Alchemy/Phrasea/Collection/CachedCollectionRepository.php
new file mode 100644
index 0000000000..fd918a53cd
--- /dev/null
+++ b/lib/Alchemy/Phrasea/Collection/CachedCollectionRepository.php
@@ -0,0 +1,87 @@
+<?php
+/*
+ * This file is part of Phraseanet
+ *
+ * (c) 2005-2015 Alchemy
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace Alchemy\Phrasea\Collection;
+
+use Doctrine\Common\Cache\Cache;
+
+final class CachedCollectionRepository implements CollectionRepository
+{
+
+    /** @var CollectionRepository */
+    private $repository;
+    /** @var Cache */
+    private $cache;
+    /** @var string */
+    private $cacheKey;
+
+    public function __construct(CollectionRepository $repository, Cache $cache, $cacheKey)
+    {
+        $this->repository = $repository;
+        $this->cache = $cache;
+        $this->cacheKey = $cacheKey;
+    }
+
+    /**
+     * @param int $databoxId
+     * @return \collection[]
+     */
+    public function findAllByDatabox($databoxId)
+    {
+        $cacheKey = hash('sha256', $this->cacheKey . '.findAll.' . $databoxId);
+        $collections = $this->cache->fetch($cacheKey);
+
+        if ($collections === false) {
+            $collections = $this->repository->findAllByDatabox($databoxId);
+            $this->save($cacheKey, $collections);
+        }
+
+        return $collections;
+    }
+
+    /**
+     * @param int $baseId
+     * @return \collection|null
+     */
+    public function find($baseId)
+    {
+        $cacheKey = hash('sha256', $this->cacheKey . '.find.' . $baseId);
+        $collection = $this->cache->fetch($cacheKey);
+
+        if ($collection === false) {
+            $collection = $this->repository->find($baseId);
+            $this->save($cacheKey, $collection);
+        }
+
+        return $collection;
+    }
+
+    /**
+     * @param int $databoxId
+     * @param int $collectionId
+     * @return \collection|null
+     */
+    public function findByCollectionId($databoxId, $collectionId)
+    {
+        $cacheKey = hash('sha256', $this->cacheKey . '.findByCollection.' . $databoxId . $collectionId);
+        $collection = $this->cache->fetch($cacheKey);
+
+        if ($collection === false) {
+            $collection = $this->repository->findByCollectionId($databoxId, $collectionId);
+            $this->save($cacheKey, $collection);
+        }
+
+        return $collection;
+    }
+
+    private function save($key, $value)
+    {
+        $this->cache->save($key, $value);
+    }
+}
diff --git a/lib/Alchemy/Phrasea/Collection/CollectionFactory.php b/lib/Alchemy/Phrasea/Collection/CollectionFactory.php
new file mode 100644
index 0000000000..bd3963fc76
--- /dev/null
+++ b/lib/Alchemy/Phrasea/Collection/CollectionFactory.php
@@ -0,0 +1,55 @@
+<?php
+
+namespace Alchemy\Phrasea\Collection;
+
+use Alchemy\Phrasea\Application;
+use Assert\Assertion;
+
+class CollectionFactory
+{
+    /**
+     * @var Application
+     */
+    private $app;
+
+    /**
+     * @param Application $application
+     */
+    public function __construct(Application $application)
+    {
+        $this->app = $application;
+    }
+
+    /**
+     * @param CollectionReference $reference
+     * @param array $row
+     * @return \collection
+     */
+    public function create(CollectionReference $reference, array $row)
+    {
+        return new \collection($this->app, $reference->getBaseId(), $reference, $row);
+    }
+
+    /**
+     * @param CollectionReference[] $collectionReferences
+     * @param array $rows
+     * @return array
+     */
+    public function createMany($collectionReferences, array $rows)
+    {
+        Assertion::allIsInstanceOf($collectionReferences, CollectionReference::class);
+
+        $collections = [];
+        $indexedReferences = [];
+
+        foreach ($collectionReferences as $reference) {
+            $indexedReferences[$reference->getCollectionId()] = $reference;
+        }
+
+        foreach ($rows as $row) {
+            $collections[$row['coll_id']] = $this->create($indexedReferences[$row['coll_id']], $row);
+        }
+
+        return $collections;
+    }
+}
diff --git a/lib/Alchemy/Phrasea/Collection/CollectionReference.php b/lib/Alchemy/Phrasea/Collection/CollectionReference.php
new file mode 100644
index 0000000000..c5f51af7d4
--- /dev/null
+++ b/lib/Alchemy/Phrasea/Collection/CollectionReference.php
@@ -0,0 +1,144 @@
+<?php
+
+namespace Alchemy\Phrasea\Collection;
+
+class CollectionReference 
+{
+    /**
+     * @var int
+     */
+    private $baseId;
+
+    /**
+     * @var int
+     */
+    private $databoxId;
+
+    /**
+     * @var int
+     */
+    private $collectionId;
+
+    /**
+     * @var int
+     */
+    private $displayIndex;
+
+    /**
+     * @var bool
+     */
+    private $isActive;
+
+    /**
+     * @var string
+     */
+    private $alias;
+
+    /**
+     * @param int $baseId
+     * @param int $databoxId
+     * @param int $collectionId
+     * @param int $displayIndex
+     * @param bool $isActive
+     * @param string $alias
+     */
+    public function __construct($baseId, $databoxId, $collectionId, $displayIndex, $isActive, $alias)
+    {
+        $this->baseId = (int) $baseId;
+        $this->databoxId = (int) $databoxId;
+        $this->collectionId = (int) $collectionId;
+        $this->displayIndex = (int) $displayIndex;
+        $this->isActive = (bool) $isActive;
+        $this->alias = (string) $alias;
+    }
+
+    /**
+     * @return int
+     */
+    public function getDataboxId()
+    {
+        return $this->databoxId;
+    }
+
+    /**
+     * @return int
+     */
+    public function getBaseId()
+    {
+        return $this->baseId;
+    }
+
+    /**
+     * @return int
+     */
+    public function getCollectionId()
+    {
+        return $this->collectionId;
+    }
+
+    /**
+     * @return int
+     */
+    public function getDisplayIndex()
+    {
+        return $this->displayIndex;
+    }
+
+    /**
+     * @param int $index
+     * @return $this
+     */
+    public function setDisplayIndex($index)
+    {
+        $this->displayIndex = (int) $index;
+
+        return $this;
+    }
+
+    /**
+     * @return boolean
+     */
+    public function isActive()
+    {
+        return $this->isActive;
+    }
+
+    /**
+     * @return $this
+     */
+    public function disable()
+    {
+        $this->isActive = false;
+
+        return $this;
+    }
+
+    /**
+     * @return $this
+     */
+    public function enable()
+    {
+        $this->isActive = true;
+
+        return $this;
+    }
+
+    /**
+     * @return string
+     */
+    public function getAlias()
+    {
+        return $this->alias;
+    }
+
+    /**
+     * @param string $alias
+     * @return $this
+     */
+    public function setAlias($alias)
+    {
+        $this->alias = (string) $alias;
+
+        return $this;
+    }
+}
diff --git a/lib/Alchemy/Phrasea/Collection/CollectionReferenceRepository.php b/lib/Alchemy/Phrasea/Collection/CollectionReferenceRepository.php
new file mode 100644
index 0000000000..0d4f92f037
--- /dev/null
+++ b/lib/Alchemy/Phrasea/Collection/CollectionReferenceRepository.php
@@ -0,0 +1,30 @@
+<?php
+
+namespace Alchemy\Phrasea\Collection;
+
+interface CollectionReferenceRepository
+{
+    /**
+     * @return CollectionReference[]
+     */
+    public function findAll();
+
+    /**
+     * @param int $databoxId
+     * @return CollectionReference[]
+     */
+    public function findAllByDatabox($databoxId);
+
+    /**
+     * @param int $baseId
+     * @return CollectionReference|null
+     */
+    public function find($baseId);
+
+    /**
+     * @param int $databoxId
+     * @param int $collectionId
+     * @return CollectionReference|null
+     */
+    public function findByCollectionId($databoxId, $collectionId);
+}
diff --git a/lib/Alchemy/Phrasea/Collection/CollectionRepository.php b/lib/Alchemy/Phrasea/Collection/CollectionRepository.php
new file mode 100644
index 0000000000..5da5c4a492
--- /dev/null
+++ b/lib/Alchemy/Phrasea/Collection/CollectionRepository.php
@@ -0,0 +1,26 @@
+<?php
+
+namespace Alchemy\Phrasea\Collection;
+
+interface CollectionRepository 
+{
+
+    /**
+     * @param int $databoxId
+     * @return \collection[]
+     */
+    public function findAllByDatabox($databoxId);
+
+    /**
+     * @param int $baseId
+     * @return \collection|null
+     */
+    public function find($baseId);
+
+    /**
+     * @param int $databoxId
+     * @param int $collectionId
+     * @return \collection|null
+     */
+    public function findByCollectionId($databoxId, $collectionId);
+}
diff --git a/lib/Alchemy/Phrasea/Collection/DbalCollectionReferenceRepository.php b/lib/Alchemy/Phrasea/Collection/DbalCollectionReferenceRepository.php
new file mode 100644
index 0000000000..93cfb7d64c
--- /dev/null
+++ b/lib/Alchemy/Phrasea/Collection/DbalCollectionReferenceRepository.php
@@ -0,0 +1,110 @@
+<?php
+
+namespace Alchemy\Phrasea\Collection;
+
+use Doctrine\DBAL\Connection;
+
+class DbalCollectionReferenceRepository implements CollectionReferenceRepository
+{
+
+    private static $query = 'SELECT base_id AS baseId, sbas_id AS databoxId, server_coll_id AS collectionId,
+                                    ord AS displayIndex, active AS isActive, aliases AS alias
+                              FROM bas';
+
+    /**
+     * @var Connection
+     */
+    private $connection;
+
+    /**
+     * @param Connection $connection
+     */
+    public function __construct(Connection $connection)
+    {
+        $this->connection = $connection;
+    }
+
+    /**
+     * @return CollectionReference[]
+     */
+    public function findAll()
+    {
+        return $this->createManyReferences($this->connection->fetchAll(self::$query));
+    }
+
+    /**
+     * @param int $databoxId
+     * @return CollectionReference[]
+     */
+    public function findAllByDatabox($databoxId)
+    {
+        $query = self::$query . ' WHERE sbas_id = :databoxId';
+        $rows = $this->connection->fetchAll($query, [ ':databoxId' => $databoxId ]);
+
+        return $this->createManyReferences($rows);
+    }
+
+    /**
+     * @param int $baseId
+     * @return CollectionReference|null
+     */
+    public function find($baseId)
+    {
+        $query = self::$query . ' WHERE base_id = :baseId';
+        $row = $this->connection->fetchAssoc($query, [ ':baseId' => $baseId ]);
+
+        if ($row !== false) {
+            return $this->createReference($row);
+        }
+
+        return null;
+    }
+
+    /**
+     * @param int $databoxId
+     * @param int $collectionId
+     * @return CollectionReference|null
+     */
+    public function findByCollectionId($databoxId, $collectionId)
+    {
+        $query = self::$query . ' WHERE sbas_id = :databoxId AND server_coll_id = :collectionId';
+        $row = $this->connection->fetchAssoc($query, [ ':databoxId' => $databoxId, ':collectionId' => $collectionId ]);
+
+        if ($row !== false) {
+            return $this->createReference($row);
+        }
+
+        return null;
+    }
+
+    /**
+     * @param array $row
+     * @return CollectionReference
+     */
+    private function createReference(array $row)
+    {
+        return new CollectionReference(
+            $row['baseId'],
+            $row['databoxId'],
+            $row['collectionId'],
+            $row['displayIndex'],
+            $row['isActive'],
+            $row['alias']
+        );
+    }
+
+    /**
+     * @param $rows
+     * @return array
+     */
+    private function createManyReferences($rows)
+    {
+        $references = [];
+
+        foreach ($rows as $row) {
+            $references[$row['baseId']] = $this->createReference($row);
+        }
+
+        return $references;
+    }
+}
diff --git a/lib/Alchemy/Phrasea/Collection/DbalCollectionRepository.php b/lib/Alchemy/Phrasea/Collection/DbalCollectionRepository.php
new file mode 100644
index 0000000000..826894dcd3
--- /dev/null
+++ b/lib/Alchemy/Phrasea/Collection/DbalCollectionRepository.php
@@ -0,0 +1,107 @@
+<?php
+
+namespace Alchemy\Phrasea\Collection;
+
+use Alchemy\Phrasea\Databox\DataboxConnectionProvider;
+
+class DbalCollectionRepository implements CollectionRepository
+{
+
+    private static $query = 'SELECT coll_id, asciiname, label_en, label_fr, label_de, label_nl, prefs, logo, majLogo, pub_wm
+                                FROM coll';
+
+    /**
+     * @var CollectionReferenceRepository
+     */
+    private $referenceRepository;
+
+    /**
+     * @var DataboxConnectionProvider
+     */
+    private $connectionProvider;
+
+    /**
+     * @var CollectionFactory
+     */
+    private $collectionFactory;
+
+    public function __construct(
+        DataboxConnectionProvider $connectionProvider,
+        CollectionReferenceRepository $referenceRepository,
+        CollectionFactory $collectionFactory
+    ) {
+        $this->connectionProvider = $connectionProvider;
+        $this->referenceRepository = $referenceRepository;
+        $this->collectionFactory = $collectionFactory;
+    }
+
+    /**
+     * @param int $databoxId
+     * @return \collection[]
+     */
+    public function findAllByDatabox($databoxId)
+    {
+        $references = $this->referenceRepository->findAllByDatabox($databoxId);
+        $connection = $this->connectionProvider->getConnection($databoxId);
+
+        $params = [];
+
+        foreach ($references as $reference) {
+            $params[':id_' . $reference->getCollectionId()] = $reference->getCollectionId();
+        }
+
+        $query = self::$query . sprintf(' WHERE coll_id IN (%s)', implode(', ', array_keys($params)));
+        $rows = $connection->fetchAll($query, $params);
+
+        return $this->collectionFactory->createMany($references, $rows);
+    }
+
+    /**
+     * @param int $baseId
+     * @return \collection|null
+     */
+    public function find($baseId)
+    {
+        $reference = $this->referenceRepository->find($baseId);
+
+        if ($reference === null) {
+            return null;
+        }
+
+        $connection = $this->connectionProvider->getConnection($reference->getDataboxId());
+
+        $query = self::$query . ' WHERE coll_id = :collectionId';
+        $row = $connection->fetchAssoc($query, [ ':collectionId' => $reference->getCollectionId() ]);
+
+        if ($row !== false) {
+            return $this->collectionFactory->create($reference, $row);
+        }
+
+        return null;
+    }
+
+    /**
+     * @param int $databoxId
+     * @param int $collectionId
+     * @return \collection|null
+     */
+    public function findByCollectionId($databoxId, $collectionId)
+    {
+        $reference = $this->referenceRepository->findByCollectionId($databoxId, $collectionId);
+
+        if ($reference === null) {
+            return null;
+        }
+
+        $connection = $this->connectionProvider->getConnection($databoxId);
+
+        $query = self::$query . ' WHERE coll_id = :collectionId';
+        $row = $connection->fetchAssoc($query, [ ':collectionId' => $reference->getCollectionId() ]);
+
+        if ($row !== false) {
+            return $this->collectionFactory->create($row['baseId'], $reference, $row);
+        }
+
+        return null;
+    }
+}
diff --git a/lib/Alchemy/Phrasea/Command/RecordAdd.php b/lib/Alchemy/Phrasea/Command/RecordAdd.php
index 11369e3126..fd4c05c857 100644
--- a/lib/Alchemy/Phrasea/Command/RecordAdd.php
+++ b/lib/Alchemy/Phrasea/Command/RecordAdd.php
@@ -43,7 +43,7 @@ class RecordAdd extends Command
     protected function doExecute(InputInterface $input, OutputInterface $output)
     {
         try {
-            $collection = \collection::get_from_base_id($this->container, $input->getArgument('base_id'));
+            $collection = \collection::getByBaseId($this->container, $input->getArgument('base_id'));
         } catch (\Exception $e) {
             throw new \InvalidArgumentException(sprintf('Collection %s is invalid', $input->getArgument('base_id')));
         }
diff --git a/lib/Alchemy/Phrasea/Command/Upgrade/Step31.php b/lib/Alchemy/Phrasea/Command/Upgrade/Step31.php
index b90f181a08..f2944e783e 100644
--- a/lib/Alchemy/Phrasea/Command/Upgrade/Step31.php
+++ b/lib/Alchemy/Phrasea/Command/Upgrade/Step31.php
@@ -125,7 +125,7 @@ class Step31 implements DatasUpgraderInterface
         $uuid = Uuid::uuid4();
         try {
             $media = $this->app->getMediaFromUri($pathfile);
-            $collection = \collection::get_from_coll_id($this->$app, $databox, (int) $record['coll_id']);
+            $collection = \collection::getByCollectionId($this->$app, $databox, (int) $record['coll_id']);
 
             $file = new File($this->app, $media, $collection);
             $uuid = $file->getUUID(true, true);
diff --git a/lib/Alchemy/Phrasea/Controller/Admin/CollectionController.php b/lib/Alchemy/Phrasea/Controller/Admin/CollectionController.php
index 59aa532f05..b1c55ac100 100644
--- a/lib/Alchemy/Phrasea/Controller/Admin/CollectionController.php
+++ b/lib/Alchemy/Phrasea/Controller/Admin/CollectionController.php
@@ -33,7 +33,7 @@ class CollectionController extends Controller
      */
     public function getCollection(Request $request, $bas_id)
     {
-        $collection = \collection::get_from_base_id($this->app, $bas_id);
+        $collection = \collection::getByBaseId($this->app, $bas_id);
 
         $admins = [];
 
@@ -144,7 +144,7 @@ class CollectionController extends Controller
         $success = false;
         $msg = $this->app->trans('An error occurred');
 
-        $collection = \collection::get_from_base_id($this->app, $bas_id);
+        $collection = \collection::getByBaseId($this->app, $bas_id);
         try {
             if ($collection->get_record_amount() <= 500) {
                 $collection->empty_collection(500);
@@ -184,7 +184,7 @@ class CollectionController extends Controller
     {
         $success = false;
 
-        $collection = \collection::get_from_base_id($this->app, $bas_id);
+        $collection = \collection::getByBaseId($this->app, $bas_id);
 
         try {
             $this->app->getApplicationBox()->write_collection_pic(
@@ -224,7 +224,7 @@ class CollectionController extends Controller
     {
         $success = false;
 
-        $collection = \collection::get_from_base_id($this->app, $bas_id);
+        $collection = \collection::getByBaseId($this->app, $bas_id);
 
         try {
             $this->app->getApplicationBox()->write_collection_pic(
@@ -264,7 +264,7 @@ class CollectionController extends Controller
     {
         $success = false;
 
-        $collection = \collection::get_from_base_id($this->app, $bas_id);
+        $collection = \collection::getByBaseId($this->app, $bas_id);
 
         try {
             $collection->update_logo(null);
@@ -323,7 +323,7 @@ class CollectionController extends Controller
             ]);
         }
 
-        $collection = \collection::get_from_base_id($this->app, $bas_id);
+        $collection = \collection::getByBaseId($this->app, $bas_id);
 
         try {
             $this->app->getApplicationBox()->write_collection_pic(
@@ -378,7 +378,7 @@ class CollectionController extends Controller
             ]);
         }
 
-        $collection = \collection::get_from_base_id($this->app, $bas_id);
+        $collection = \collection::getByBaseId($this->app, $bas_id);
 
         try {
             $this->app->getApplicationBox()->write_collection_pic(
@@ -432,7 +432,7 @@ class CollectionController extends Controller
             ]);
         }
 
-        $collection = \collection::get_from_base_id($this->app, $bas_id);
+        $collection = \collection::getByBaseId($this->app, $bas_id);
 
         try {
             $this->app->getApplicationBox()->write_collection_pic(
@@ -468,7 +468,7 @@ class CollectionController extends Controller
         $success = false;
         $msg = $this->app->trans('An error occured');
 
-        $collection = \collection::get_from_base_id($this->app, $bas_id);
+        $collection = \collection::getByBaseId($this->app, $bas_id);
 
         try {
             if ($collection->get_record_amount() > 0) {
@@ -522,7 +522,7 @@ class CollectionController extends Controller
     {
         $success = false;
 
-        $collection = \collection::get_from_base_id($this->app, $bas_id);
+        $collection = \collection::getByBaseId($this->app, $bas_id);
 
         try {
             $collection->unmount_collection($this->app);
@@ -562,7 +562,7 @@ class CollectionController extends Controller
 
         $success = false;
 
-        $collection = \collection::get_from_base_id($this->app, $bas_id);
+        $collection = \collection::getByBaseId($this->app, $bas_id);
 
         try {
             $collection->set_name($name);
@@ -594,7 +594,7 @@ class CollectionController extends Controller
             $this->app->abort(400, $this->app->trans('Invalid labels parameter'));
         }
 
-        $collection = \collection::get_from_base_id($this->app, $bas_id);
+        $collection = \collection::getByBaseId($this->app, $bas_id);
         $success = true;
 
         try {
@@ -638,7 +638,7 @@ class CollectionController extends Controller
 
         $success = false;
 
-        $collection = \collection::get_from_base_id($this->app, $bas_id);
+        $collection = \collection::getByBaseId($this->app, $bas_id);
 
         try {
             $collection->set_public_presentation($watermark);
@@ -671,7 +671,7 @@ class CollectionController extends Controller
     {
         $success = false;
 
-        $collection = \collection::get_from_base_id($this->app, $bas_id);
+        $collection = \collection::getByBaseId($this->app, $bas_id);
 
         try {
             $collection->enable($this->app->getApplicationBox());
@@ -704,7 +704,7 @@ class CollectionController extends Controller
     {
         $success = false;
 
-        $collection = \collection::get_from_base_id($this->app, $bas_id);
+        $collection = \collection::getByBaseId($this->app, $bas_id);
 
         try {
             $collection->disable($this->app->getApplicationBox());
@@ -736,7 +736,7 @@ class CollectionController extends Controller
     {
         /** @var \databox $databox */
         $databox = $this->app->findDataboxById(\phrasea::sbasFromBas($this->app, $bas_id));
-        $collection = \collection::get_from_base_id($this->app, $bas_id);
+        $collection = \collection::getByBaseId($this->app, $bas_id);
         $structFields = $suggestedValues = $basePrefs = [];
 
         /** @var \databox_field $meta */
@@ -806,7 +806,7 @@ class CollectionController extends Controller
     {
         $success = false;
 
-        $collection = \collection::get_from_base_id($this->app, $bas_id);
+        $collection = \collection::getByBaseId($this->app, $bas_id);
         $prefs = $request->request->get('str');
 
         try {
@@ -843,7 +843,7 @@ class CollectionController extends Controller
      */
     public function getDetails($bas_id)
     {
-        $collection = \collection::get_from_base_id($this->app, $bas_id);
+        $collection = \collection::getByBaseId($this->app, $bas_id);
 
         $out = ['total' => ['totobj' => 0, 'totsiz' => 0, 'mega'   => '0', 'giga'   => '0'], 'result' => []];
 
diff --git a/lib/Alchemy/Phrasea/Controller/Admin/DataboxController.php b/lib/Alchemy/Phrasea/Controller/Admin/DataboxController.php
index d1f6e8789b..21dd1a9bf0 100644
--- a/lib/Alchemy/Phrasea/Controller/Admin/DataboxController.php
+++ b/lib/Alchemy/Phrasea/Controller/Admin/DataboxController.php
@@ -639,7 +639,7 @@ class DataboxController extends Controller
     {
         try {
             foreach ($request->request->get('order', []) as $data) {
-                $collection = \collection::get_from_base_id($this->app, $data['id']);
+                $collection = \collection::getByBaseId($this->app, $data['id']);
                 $collection->set_ord($data['offset']);
             }
             $success = true;
diff --git a/lib/Alchemy/Phrasea/Controller/Admin/FeedController.php b/lib/Alchemy/Phrasea/Controller/Admin/FeedController.php
index 33becac80e..95752a53a3 100644
--- a/lib/Alchemy/Phrasea/Controller/Admin/FeedController.php
+++ b/lib/Alchemy/Phrasea/Controller/Admin/FeedController.php
@@ -56,7 +56,7 @@ class FeedController extends Controller
         if ($request->request->get('public') == '1') {
             $feed->setIsPublic(true);
         } elseif ($request->request->get('base_id')) {
-            $feed->setCollection(\collection::get_from_base_id($this->app, $request->request->get('base_id')));
+            $feed->setCollection(\collection::getByBaseId($this->app, $request->request->get('base_id')));
         }
 
         $publisher->setFeed($feed);
@@ -106,7 +106,7 @@ class FeedController extends Controller
         }
 
         try {
-            $collection = \collection::get_from_base_id($this->app, $request->request->get('base_id'));
+            $collection = \collection::getByBaseId($this->app, $request->request->get('base_id'));
         } catch (\Exception $e) {
             $collection = null;
         }
diff --git a/lib/Alchemy/Phrasea/Controller/Admin/UserController.php b/lib/Alchemy/Phrasea/Controller/Admin/UserController.php
index 6c34c876a9..501b385f57 100644
--- a/lib/Alchemy/Phrasea/Controller/Admin/UserController.php
+++ b/lib/Alchemy/Phrasea/Controller/Admin/UserController.php
@@ -454,7 +454,7 @@ class UserController extends Controller
                     $registrationRepository->getUserRegistrations(
                     $user,
                     array_map(function ($baseId) {
-                        return \collection::get_from_base_id($this->app, $baseId);
+                        return \collection::getByBaseId($this->app, $baseId);
                     }, $bases)
                 ) as $registration) {
                     $registrationManipulator->rejectRegistration($registration);
@@ -472,7 +472,7 @@ class UserController extends Controller
                 foreach ($registrationRepository->getUserRegistrations(
                     $user,
                     array_map(function ($baseId) {
-                        return \collection::get_from_base_id($this->app, $baseId);
+                        return \collection::getByBaseId($this->app, $baseId);
                     }, $bases)
                 ) as $registration) {
                     $done[$usr][$registration->getBaseId()] = true;
@@ -494,7 +494,7 @@ class UserController extends Controller
                 $acceptColl = $denyColl = [];
 
                 foreach ($bases as $bas => $isok) {
-                    $collection = \collection::get_from_base_id($this->app, $bas);
+                    $collection = \collection::getByBaseId($this->app, $bas);
 
                     if ($isok) {
                         $acceptColl[] = $collection->get_label($this->app['locale']);
diff --git a/lib/Alchemy/Phrasea/Controller/Api/V1Controller.php b/lib/Alchemy/Phrasea/Controller/Api/V1Controller.php
index a283220cd2..7229b5832a 100644
--- a/lib/Alchemy/Phrasea/Controller/Api/V1Controller.php
+++ b/lib/Alchemy/Phrasea/Controller/Api/V1Controller.php
@@ -798,7 +798,7 @@ class V1Controller extends Controller
             return $this->getBadRequestAction($request, 'Missing base_id parameter');
         }
 
-        $collection = \collection::get_from_base_id($this->app, $request->get('base_id'));
+        $collection = \collection::getByBaseId($this->app, $request->get('base_id'));
 
         if (!$this->getAclForUser()->has_right_on_base($request->get('base_id'), 'canaddrecord')) {
             return Result::createError($request, 403, sprintf(
@@ -896,7 +896,7 @@ class V1Controller extends Controller
         $media = $this->app->getMediaFromUri($file->getPathname());
         $record = $this->findDataboxById($request->get('databox_id'))->get_record($request->get('record_id'));
         $base_id = $record->get_base_id();
-        $collection = \collection::get_from_base_id($this->app, $base_id);
+        $collection = \collection::getByBaseId($this->app, $base_id);
         if (!$this->getAclForUser()->has_right_on_base($base_id, 'canaddrecord')) {
             return Result::create($request, 403, sprintf(
                 'You do not have access to collection %s', $collection->get_label($this->app['locale.I18n'])
@@ -1572,7 +1572,7 @@ class V1Controller extends Controller
         $record = $databox->get_record($record_id);
 
         try {
-            $collection = \collection::get_from_base_id($this->app, $request->get('base_id'));
+            $collection = \collection::getByBaseId($this->app, $request->get('base_id'));
             $record->move_to_collection($collection, $this->getApplicationBox());
 
             return Result::create($request, ["record" => $this->listRecord($request, $record)])->createResponse();
@@ -2064,7 +2064,7 @@ class V1Controller extends Controller
             $this->app->abort(400, 'Request body does not contains a valid "story" object');
         }
 
-        $collection = \collection::get_from_base_id($this->app, $data->{'base_id'});
+        $collection = \collection::getByBaseId($this->app, $data->{'base_id'});
 
         if (!$this->getAclForUser()->has_right_on_base($collection->get_base_id(), 'canaddrecord')) {
             $this->app->abort(403, sprintf('You can not create a story on this collection %s', $collection->get_base_id()));
diff --git a/lib/Alchemy/Phrasea/Controller/PermalinkController.php b/lib/Alchemy/Phrasea/Controller/PermalinkController.php
index e5f4a94e8b..4b33e4ab91 100644
--- a/lib/Alchemy/Phrasea/Controller/PermalinkController.php
+++ b/lib/Alchemy/Phrasea/Controller/PermalinkController.php
@@ -157,7 +157,7 @@ class PermalinkController extends AbstractDelivery
             return $this->deliverContentWithCaptionLink($request, $record, $subdef, $watermark, $stamp, $token);
         }
 
-        $collection = \collection::get_from_base_id($this->app, $record->get_base_id());
+        $collection = \collection::getByBaseId($this->app, $record->get_base_id());
         switch ($collection->get_pub_wm()) {
             default:
             case 'none':
diff --git a/lib/Alchemy/Phrasea/Controller/Prod/MoveCollectionController.php b/lib/Alchemy/Phrasea/Controller/Prod/MoveCollectionController.php
index fee6e9d70e..b45aafa6d6 100644
--- a/lib/Alchemy/Phrasea/Controller/Prod/MoveCollectionController.php
+++ b/lib/Alchemy/Phrasea/Controller/Prod/MoveCollectionController.php
@@ -58,7 +58,7 @@ class MoveCollectionController extends Controller
             }
 
             try {
-                $collection = \collection::get_from_base_id($this->app, $request->request->get('base_id'));
+                $collection = \collection::getByBaseId($this->app, $request->request->get('base_id'));
             } catch (\Exception_Databox_CollectionNotFound $e) {
                 $datas['message'] = $this->app->trans('Invalid target collection');
 
diff --git a/lib/Alchemy/Phrasea/Controller/Prod/StoryController.php b/lib/Alchemy/Phrasea/Controller/Prod/StoryController.php
index bd1cceadc4..1d335b7312 100644
--- a/lib/Alchemy/Phrasea/Controller/Prod/StoryController.php
+++ b/lib/Alchemy/Phrasea/Controller/Prod/StoryController.php
@@ -33,7 +33,7 @@ class StoryController extends Controller
 
     public function postCreateFormAction(Request $request)
     {
-        $collection = \collection::get_from_base_id($this->app, $request->request->get('base_id'));
+        $collection = \collection::getByBaseId($this->app, $request->request->get('base_id'));
 
         if (!$this->getAclForUser()->has_right_on_base($collection->get_base_id(), 'canaddrecord')) {
             throw new AccessDeniedHttpException('You can not create a story on this collection');
diff --git a/lib/Alchemy/Phrasea/Controller/Prod/UploadController.php b/lib/Alchemy/Phrasea/Controller/Prod/UploadController.php
index 479fab824b..feddfd1095 100644
--- a/lib/Alchemy/Phrasea/Controller/Prod/UploadController.php
+++ b/lib/Alchemy/Phrasea/Controller/Prod/UploadController.php
@@ -133,7 +133,7 @@ class UploadController extends Controller
             $this->getFilesystem()->rename($uploadedFilename, $renamedFilename);
 
             $media = $this->app->getMediaFromUri($renamedFilename);
-            $collection = \collection::get_from_base_id($this->app, $base_id);
+            $collection = \collection::getByBaseId($this->app, $base_id);
 
             $lazaretSession = new LazaretSession();
             $lazaretSession->setUser($this->getAuthenticatedUser());
diff --git a/lib/Alchemy/Phrasea/Controller/Root/AccountController.php b/lib/Alchemy/Phrasea/Controller/Root/AccountController.php
index eba11c0376..0edafb2690 100644
--- a/lib/Alchemy/Phrasea/Controller/Root/AccountController.php
+++ b/lib/Alchemy/Phrasea/Controller/Root/AccountController.php
@@ -312,7 +312,7 @@ class AccountController extends Controller
         if (0 !== count($registrations)) {
             foreach ($registrations as $baseId) {
                 $this->getRegistrationManipulator()
-                    ->createRegistration($user, \collection::get_from_base_id($this->app, $baseId));
+                    ->createRegistration($user, \collection::getByBaseId($this->app, $baseId));
             }
             $this->app->addFlash('success', $this->app->trans('Your registration requests have been taken into account.'));
         }
diff --git a/lib/Alchemy/Phrasea/Controller/Root/LoginController.php b/lib/Alchemy/Phrasea/Controller/Root/LoginController.php
index dc67e1d3f4..8e58803f1f 100644
--- a/lib/Alchemy/Phrasea/Controller/Root/LoginController.php
+++ b/lib/Alchemy/Phrasea/Controller/Root/LoginController.php
@@ -302,7 +302,7 @@ class LoginController extends Controller
                             return;
                         }
 
-                        $collection = \collection::get_from_base_id($this->app, $baseId);
+                        $collection = \collection::getByBaseId($this->app, $baseId);
                         $registrationManipulator->createRegistration($user, $collection);
                         $registrationsOK[$baseId] = $collection;
                     });
diff --git a/lib/Alchemy/Phrasea/Core/Provider/BorderManagerServiceProvider.php b/lib/Alchemy/Phrasea/Core/Provider/BorderManagerServiceProvider.php
index 0038727dc9..d659a664fb 100644
--- a/lib/Alchemy/Phrasea/Core/Provider/BorderManagerServiceProvider.php
+++ b/lib/Alchemy/Phrasea/Core/Provider/BorderManagerServiceProvider.php
@@ -70,7 +70,7 @@ class BorderManagerServiceProvider implements ServiceProviderInterface
                         $collections = [];
                         foreach ($checker['collections'] as $base_id) {
                             try {
-                                $collections[] = \collection::get_from_base_id($app, $base_id);
+                                $collections[] = \collection::getByBaseId($app, $base_id);
                             } catch (\Exception $e) {
                                 throw new \InvalidArgumentException('Invalid collection option');
                             }
diff --git a/lib/Alchemy/Phrasea/Core/Provider/RepositoriesServiceProvider.php b/lib/Alchemy/Phrasea/Core/Provider/RepositoriesServiceProvider.php
index d58db4bb8d..ba279d2867 100644
--- a/lib/Alchemy/Phrasea/Core/Provider/RepositoriesServiceProvider.php
+++ b/lib/Alchemy/Phrasea/Core/Provider/RepositoriesServiceProvider.php
@@ -12,7 +12,12 @@
 namespace Alchemy\Phrasea\Core\Provider;
 
 use Alchemy\Phrasea\Application as PhraseaApplication;
+use Alchemy\Phrasea\Collection\CollectionFactory;
+use Alchemy\Phrasea\Collection\DbalCollectionReferenceRepository;
+use Alchemy\Phrasea\Collection\DbalCollectionRepository;
+use Alchemy\Phrasea\Collection\CachedCollectionRepository;
 use Alchemy\Phrasea\Databox\CachingDataboxRepositoryDecorator;
+use Alchemy\Phrasea\Databox\DataboxConnectionProvider;
 use Alchemy\Phrasea\Databox\DataboxFactory;
 use Alchemy\Phrasea\Databox\DbalDataboxRepository;
 use Alchemy\Phrasea\Databox\Field\DataboxFieldFactory;
@@ -138,6 +143,23 @@ class RepositoriesServiceProvider implements ServiceProviderInterface
         $app['repo.fields.factory'] = $app->protect(function (\databox $databox) use ($app) {
             return new DbalDataboxFieldRepository($databox->get_connection(), new DataboxFieldFactory($app, $databox));
         });
+
+        $app['repo.collection-references'] = $app->share(function (PhraseaApplication $app) {
+            return new DbalCollectionReferenceRepository($app->getApplicationBox()->get_connection());
+        });
+
+        $app['repo.collections'] = $app->share(function (PhraseaApplication $app) {
+            $appbox = $app->getApplicationBox();
+            $factory = new CollectionFactory($app);
+            $connectionProvider = new DataboxConnectionProvider($appbox);
+            $repository =  new DbalCollectionRepository(
+                $connectionProvider,
+                $app['repo.collection-references'],
+                $factory
+            );
+
+            return new CachedCollectionRepository($repository, $app['cache'], 'collection_');
+        });
     }
 
     public function boot(Application $app)
diff --git a/lib/Alchemy/Phrasea/Databox/DataboxConnectionProvider.php b/lib/Alchemy/Phrasea/Databox/DataboxConnectionProvider.php
new file mode 100644
index 0000000000..a1601dd00d
--- /dev/null
+++ b/lib/Alchemy/Phrasea/Databox/DataboxConnectionProvider.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace Alchemy\Phrasea\Databox;
+
+class DataboxConnectionProvider 
+{
+
+    private $applicationBox;
+
+    public function __construct(\appbox $applicationBox)
+    {
+        $this->applicationBox = $applicationBox;
+    }
+
+    /**
+     * @param $databoxId
+     * @return \Doctrine\DBAL\Connection
+     */
+    public function getConnection($databoxId)
+    {
+        return $this->applicationBox->get_databox($databoxId)->get_connection();
+    }
+}
diff --git a/lib/Alchemy/Phrasea/Helper/User/Edit.php b/lib/Alchemy/Phrasea/Helper/User/Edit.php
index 770433e307..8e528148e9 100644
--- a/lib/Alchemy/Phrasea/Helper/User/Edit.php
+++ b/lib/Alchemy/Phrasea/Helper/User/Edit.php
@@ -227,7 +227,7 @@ class Edit extends \Alchemy\Phrasea\Helper\Helper
             'users'        => $this->users,
             'users_serial' => implode(';', $this->users),
             'base_id'      => $this->base_id,
-            'collection'   => \collection::get_from_base_id($this->app, $this->base_id),
+            'collection'   => \collection::getByBaseId($this->app, $this->base_id),
         ];
     }
 
@@ -331,7 +331,7 @@ class Edit extends \Alchemy\Phrasea\Helper\Helper
             'users'        => $this->users,
             'users_serial' => implode(';', $this->users),
             'base_id'      => $this->base_id,
-            'collection'   => \collection::get_from_base_id($this->app, $this->base_id),
+            'collection'   => \collection::getByBaseId($this->app, $this->base_id),
         ];
     }
 
@@ -391,7 +391,7 @@ class Edit extends \Alchemy\Phrasea\Helper\Helper
             'users'        => $this->users,
             'users_serial' => implode(';', $this->users),
             'base_id'      => $this->base_id,
-            'collection'   => \collection::get_from_base_id($this->app, $this->base_id),
+            'collection'   => \collection::getByBaseId($this->app, $this->base_id),
         ];
     }
 
diff --git a/lib/Alchemy/Phrasea/Model/Entities/Feed.php b/lib/Alchemy/Phrasea/Model/Entities/Feed.php
index 6f1c5a8a93..55a2156128 100644
--- a/lib/Alchemy/Phrasea/Model/Entities/Feed.php
+++ b/lib/Alchemy/Phrasea/Model/Entities/Feed.php
@@ -302,7 +302,7 @@ class Feed implements FeedInterface
     public function getCollection(Application $app)
     {
         if ($this->getBaseId() !== null) {
-          return \collection::get_from_base_id($app, $this->getBaseId());
+          return \collection::getByBaseId($app, $this->getBaseId());
         }
     }
 
diff --git a/lib/Alchemy/Phrasea/Model/Entities/LazaretFile.php b/lib/Alchemy/Phrasea/Model/Entities/LazaretFile.php
index d05bfeec7c..bd3af97f0c 100644
--- a/lib/Alchemy/Phrasea/Model/Entities/LazaretFile.php
+++ b/lib/Alchemy/Phrasea/Model/Entities/LazaretFile.php
@@ -211,7 +211,7 @@ class LazaretFile
      */
     public function getCollection(Application $app)
     {
-        return \collection::get_from_base_id($app, $this->getBaseId());
+        return \collection::getByBaseId($app, $this->getBaseId());
     }
 
     /**
diff --git a/lib/Alchemy/Phrasea/Model/Entities/Registration.php b/lib/Alchemy/Phrasea/Model/Entities/Registration.php
index e00b82455f..6d7e08052f 100644
--- a/lib/Alchemy/Phrasea/Model/Entities/Registration.php
+++ b/lib/Alchemy/Phrasea/Model/Entities/Registration.php
@@ -141,7 +141,7 @@ class Registration
      */
     public function getCollection(Application $app)
     {
-        return \collection::get_from_base_id($app, $this->baseId);
+        return \collection::getByBaseId($app, $this->baseId);
     }
 
     /**
diff --git a/lib/Alchemy/Phrasea/Out/Module/PDF.php b/lib/Alchemy/Phrasea/Out/Module/PDF.php
index 1f69fb1076..f9a5e43408 100644
--- a/lib/Alchemy/Phrasea/Out/Module/PDF.php
+++ b/lib/Alchemy/Phrasea/Out/Module/PDF.php
@@ -350,7 +350,7 @@ class PDF
                 }
             }
 
-            $collection = \collection::get_from_base_id($this->app, $rec->get_base_id());
+            $collection = \collection::getByBaseId($this->app, $rec->get_base_id());
 
             $vn = "";
             if (false !== $str = simplexml_load_string($collection->get_prefs())) {
diff --git a/lib/Alchemy/Phrasea/SearchEngine/SearchEngineOptions.php b/lib/Alchemy/Phrasea/SearchEngine/SearchEngineOptions.php
index 50ec3f127b..2adaca141c 100644
--- a/lib/Alchemy/Phrasea/SearchEngine/SearchEngineOptions.php
+++ b/lib/Alchemy/Phrasea/SearchEngine/SearchEngineOptions.php
@@ -480,7 +480,7 @@ class SearchEngineOptions
                     break;
                 case in_array($key, ['collections', 'business_fields']):
                     $value = array_map(function ($base_id) use ($app) {
-                                return \collection::get_from_base_id($app, $base_id);
+                                return \collection::getByBaseId($app, $base_id);
                             }, $value);
                     break;
             }
@@ -571,7 +571,7 @@ class SearchEngineOptions
             $bas = [];
             foreach ($selected_bases as $bas_id) {
                 try {
-                    $bas[$bas_id] = \collection::get_from_base_id($app, $bas_id);
+                    $bas[$bas_id] = \collection::getByBaseId($app, $bas_id);
                 } catch (\Exception_Databox_CollectionNotFound $e) {
                     // Ignore
                 }
diff --git a/lib/Alchemy/Phrasea/TaskManager/Job/ArchiveJob.php b/lib/Alchemy/Phrasea/TaskManager/Job/ArchiveJob.php
index 29376a82b6..5b4ef9c861 100644
--- a/lib/Alchemy/Phrasea/TaskManager/Job/ArchiveJob.php
+++ b/lib/Alchemy/Phrasea/TaskManager/Job/ArchiveJob.php
@@ -867,7 +867,7 @@ class ArchiveJob extends AbstractJob
             }
 
             try {
-                $collection = \collection::get_from_coll_id($app, $databox, (int) $cid);
+                $collection = \collection::getByCollectionId($app, $databox, (int) $cid);
                 if ($captionFileName === null) {
                     $story = $this->createStory($app, $collection, $path . '/' . $representationFileName, null, $stat0, $stat1);
                 } else {
@@ -1200,7 +1200,7 @@ class ArchiveJob extends AbstractJob
         }
 
         try {
-            $collection = \collection::get_from_coll_id($app, $databox, (int) $cid);
+            $collection = \collection::getByCollectionId($app, $databox, (int) $cid);
 
             if ($captionFileName === null) {
                 $this->createRecord($app, $collection, $path . '/' . $file, null, $grp_rid, null, $stat0, $stat1);
diff --git a/lib/Alchemy/Phrasea/TaskManager/Job/EmptyCollectionJob.php b/lib/Alchemy/Phrasea/TaskManager/Job/EmptyCollectionJob.php
index b788ad8b08..6f4ff51027 100644
--- a/lib/Alchemy/Phrasea/TaskManager/Job/EmptyCollectionJob.php
+++ b/lib/Alchemy/Phrasea/TaskManager/Job/EmptyCollectionJob.php
@@ -61,7 +61,7 @@ class EmptyCollectionJob extends AbstractJob
 
         $baseId = (string) $settings->bas_id;
 
-        $collection = \collection::get_from_base_id($app, $baseId);
+        $collection = \collection::getByBaseId($app, $baseId);
         $collection->empty_collection(200);
 
         if (0 === $collection->get_record_amount()) {
diff --git a/lib/Alchemy/Phrasea/TaskManager/Job/RecordMoverJob.php b/lib/Alchemy/Phrasea/TaskManager/Job/RecordMoverJob.php
index 13b79f4727..723bea85f3 100644
--- a/lib/Alchemy/Phrasea/TaskManager/Job/RecordMoverJob.php
+++ b/lib/Alchemy/Phrasea/TaskManager/Job/RecordMoverJob.php
@@ -82,7 +82,7 @@ class RecordMoverJob extends AbstractJob
             case 'UPDATE':
                 // change collection ?
                 if (array_key_exists('coll', $row)) {
-                    $coll = \collection::get_from_coll_id($app, $databox, $row['coll']);
+                    $coll = \collection::getByCollectionId($app, $databox, $row['coll']);
                     $rec->move_to_collection($coll, $app['phraseanet.appbox']);
                     if ($logsql) {
                         $this->log('debug', sprintf("on sbas %s move rid %s to coll %s \n", $row['sbas_id'], $row['record_id'], $coll->get_coll_id()));
diff --git a/lib/classes/ACL.php b/lib/classes/ACL.php
index fbd87f10ef..8c41a56fa7 100644
--- a/lib/classes/ACL.php
+++ b/lib/classes/ACL.php
@@ -717,7 +717,7 @@ class ACL implements cache_cacheableInterface
                 }
 
                 try {
-                    $ret[$base_id] = collection::get_from_base_id($this->app, $base_id);
+                    $ret[$base_id] = collection::getByBaseId($this->app, $base_id);
                 } catch (\Exception $e) {
 
                 }
@@ -1655,7 +1655,7 @@ class ACL implements cache_cacheableInterface
         $collections = [];
 
         foreach ($rs as $row) {
-            $collections[] = \collection::get_from_base_id($this->app, $row['base_id']);
+            $collections[] = \collection::getByBaseId($this->app, $row['base_id']);
         }
 
         return $collections;
diff --git a/lib/classes/appbox.php b/lib/classes/appbox.php
index 5934bfab2e..6df141463b 100644
--- a/lib/classes/appbox.php
+++ b/lib/classes/appbox.php
@@ -16,7 +16,6 @@ use Alchemy\Phrasea\Core\Version\AppboxVersionRepository;
 use Alchemy\Phrasea\Databox\DataboxRepository;
 use Doctrine\ORM\Tools\SchemaTool;
 use MediaAlchemyst\Alchemyst;
-use MediaAlchemyst\Specification\Image as ImageSpecification;
 use Symfony\Component\Filesystem\Filesystem;
 use Symfony\Component\HttpFoundation\File\File as SymfoFile;
 use Symfony\Component\Finder\Finder;
@@ -257,9 +256,13 @@ class appbox extends base
         return $this->databoxes;
     }
 
+    /**
+     * @param int $sbas_id
+     * @return databox
+     */
     public function get_databox($sbas_id)
     {
-        $databoxes = $this->get_databoxes();
+        $databoxes = $this->getDataboxRepository()->findAll();
 
         if (!isset($databoxes[$sbas_id]) && !array_key_exists($sbas_id, $databoxes)) {
             throw new NotFoundHttpException('Databox `' . $sbas_id . '` not found');
diff --git a/lib/classes/collection.php b/lib/classes/collection.php
index d3c7516f10..cefde0d517 100644
--- a/lib/classes/collection.php
+++ b/lib/classes/collection.php
@@ -10,6 +10,8 @@
  */
 
 use Alchemy\Phrasea\Application;
+use Alchemy\Phrasea\Collection\CollectionReference;
+use Alchemy\Phrasea\Collection\CollectionRepository;
 use Alchemy\Phrasea\Core\Event\Collection\CollectionEvent;
 use Alchemy\Phrasea\Core\Event\Collection\CollectionEvents;
 use Alchemy\Phrasea\Core\Event\Collection\CreatedEvent;
@@ -23,125 +25,279 @@ use Symfony\Component\HttpFoundation\File\File;
 
 class collection implements cache_cacheableInterface, ThumbnailedElement
 {
-    protected $base_id;
-    protected $sbas_id;
-    protected $coll_id;
-    protected $available = false;
-    protected $name;
-    protected $prefs;
-    protected $pub_wm;
-    protected $labels = [];
-    private static $_logos = [];
-    private static $_stamps = [];
-    private static $_watermarks = [];
-    private static $_presentations = [];
-    private static $_collections = [];
-    protected $databox;
-    protected $is_active;
-    protected $binary_logo;
-    protected $ord;
-    protected $app;
 
     const PIC_LOGO = 'minilogos';
     const PIC_WM = 'wm';
     const PIC_STAMP = 'stamp';
     const PIC_PRESENTATION = 'presentation';
 
-    protected function __construct(Application $app, $coll_id, databox $databox)
+    private static $_logos = [];
+    private static $_stamps = [];
+    private static $_watermarks = [];
+    private static $_presentations = [];
+    private static $_collections = [];
+
+    private static function getNewOrder(Connection $conn, $sbas_id)
     {
-        $this->app = $app;
-        $this->databox = $databox;
-        $this->sbas_id = (int) $databox->get_sbas_id();
-        $this->coll_id = (int) $coll_id;
-        $this->load();
-
-        return $this;
-    }
-
-    private function dispatch($eventName, CollectionEvent $event)
-    {
-        $this->app['dispatcher']->dispatch($eventName, $event);
-    }
-
-    protected function load()
-    {
-        try {
-            $datas = $this->get_data_from_cache();
-            if (!is_array($datas)) {
-                throw new \Exception('Collection could not be retrieved from cache');
-            }
-            $this->is_active = $datas['is_active'];
-            $this->base_id = $datas['base_id'];
-            $this->available = $datas['available'];
-            $this->pub_wm = $datas['pub_wm'];
-            $this->name = $datas['name'];
-            $this->ord = $datas['ord'];
-            $this->prefs = $datas['prefs'];
-            $this->labels = $datas['labels'];
-
-            return $this;
-        } catch (\Exception $e) {
-
-        }
-
-        $connbas = $this->databox->get_connection();
-        $sql = 'SELECT
-                    asciiname, prefs, pub_wm, coll_id,
-                    label_en, label_fr, label_de, label_nl
-                FROM coll WHERE coll_id = :coll_id';
-        $stmt = $connbas->prepare($sql);
-        $stmt->execute([':coll_id' => $this->coll_id]);
-        $row = $stmt->fetch(PDO::FETCH_ASSOC);
+        $sql = "SELECT GREATEST(0, MAX(ord)) + 1 AS ord FROM bas WHERE sbas_id = :sbas_id";
+        $stmt = $conn->prepare($sql);
+        $stmt->execute([':sbas_id' => $sbas_id]);
+        $ord = $stmt->fetch(\PDO::FETCH_ASSOC);
         $stmt->closeCursor();
 
-        if ( ! $row)
-            throw new Exception('Unknown collection ' . $this->coll_id . ' on ' . $this->databox->get_dbname());
+        return $ord['ord'] ?: 1;
+    }
 
+    public static function create(Application $app, databox $databox, appbox $appbox, $name, User $user = null)
+    {
+        $sbas_id = $databox->get_sbas_id();
+        $connbas = $databox->get_connection();
+        $conn = $appbox->get_connection();
+        $new_bas = false;
+
+        $prefs = <<<EOT
+<?xml version="1.0" encoding="UTF-8"?>
+<baseprefs>
+    <status>0</status>
+    <sugestedValues></sugestedValues>
+</baseprefs>
+EOT;
+
+        $sql = "INSERT INTO coll (coll_id, asciiname, prefs, logo)
+                VALUES (null, :name, :prefs, '')";
+
+        $params = [
+            ':name' => $name,
+            'prefs'  => $prefs,
+        ];
+
+        $stmt = $connbas->prepare($sql);
+        $stmt->execute($params);
+        $stmt->closeCursor();
+
+        $new_id = (int) $connbas->lastInsertId();
+
+        $sql = "INSERT INTO bas (base_id, active, ord, server_coll_id, sbas_id, aliases)
+            VALUES
+            (null, 1, :ord, :server_coll_id, :sbas_id, '')";
+        $stmt = $conn->prepare($sql);
+        $stmt->execute([
+            ':server_coll_id' => $new_id,
+            ':sbas_id' => $sbas_id,
+            ':ord' => self::getNewOrder($conn, $sbas_id),
+        ]);
+        $stmt->closeCursor();
+
+        $new_bas = $conn->lastInsertId();
+        $databox->delete_data_from_cache(databox::CACHE_COLLECTIONS);
+        $appbox->delete_data_from_cache(appbox::CACHE_LIST_BASES);
+
+        phrasea::reset_baseDatas($appbox);
+
+        $collection = self::getByCollectionId($app, $databox, $new_id);
+
+        if (null !== $user) {
+            $collection->set_admin($new_bas, $user);
+        }
+
+        $app['dispatcher']->dispatch(CollectionEvents::CREATED, new CreatedEvent($collection));
+
+        return $collection;
+    }
+
+    public static function mount_collection(Application $app, databox $databox, $coll_id, User $user)
+    {
+        $sql = "INSERT INTO bas (base_id, active, server_coll_id, sbas_id, aliases, ord)
+            VALUES
+            (null, 1, :server_coll_id, :sbas_id, '', :ord)";
+        $stmt = $databox->get_appbox()->get_connection()->prepare($sql);
+        $stmt->execute([
+            ':server_coll_id' => $coll_id,
+            ':sbas_id'        => $databox->get_sbas_id(),
+            ':ord'            => self::getNewOrder($databox->get_appbox()->get_connection(), $databox->get_sbas_id()),
+        ]);
+        $stmt->closeCursor();
+
+        $new_bas = $databox->get_appbox()->get_connection()->lastInsertId();
+        $databox->get_appbox()->delete_data_from_cache(appbox::CACHE_LIST_BASES);
+
+        $databox->delete_data_from_cache(databox::CACHE_COLLECTIONS);
+
+        cache_databox::update($app, $databox->get_sbas_id(), 'structure');
+
+        phrasea::reset_baseDatas($databox->get_appbox());
+
+        $coll = self::getByBaseId($app, $new_bas);
+        $coll->set_admin($new_bas, $user);
+
+        return $new_bas;
+    }
+
+    public static function getLogo($base_id, Application $app, $printname = false)
+    {
+        $base_id_key = $base_id . '_' . ($printname ? '1' : '0');
+
+        if ( ! isset(self::$_logos[$base_id_key])) {
+
+            if (is_file($app['root.path'] . '/config/minilogos/' . $base_id)) {
+                $name = phrasea::bas_labels($base_id, $app);
+                self::$_logos[$base_id_key] = '<img title="' . $name
+                    . '" src="/custom/minilogos/' . $base_id . '" />';
+            } elseif ($printname) {
+                self::$_logos[$base_id_key] = phrasea::bas_labels($base_id, $app);
+            }
+        }
+
+        return isset(self::$_logos[$base_id_key]) ? self::$_logos[$base_id_key] : '';
+    }
+
+    public static function getWatermark($base_id)
+    {
+        if ( ! isset(self::$_watermarks['base_id'])) {
+
+            if (is_file(__DIR__  . '/../../config/wm/' . $base_id))
+                self::$_watermarks['base_id'] = '<img src="/custom/wm/' . $base_id . '" />';
+        }
+
+        return isset(self::$_watermarks['base_id']) ? self::$_watermarks['base_id'] : '';
+    }
+
+    public static function getPresentation($base_id)
+    {
+        if ( ! isset(self::$_presentations['base_id'])) {
+
+            if (is_file(__DIR__ . '/../../config/presentation/' . $base_id))
+                self::$_presentations['base_id'] = '<img src="/custom/presentation/' . $base_id . '" />';
+        }
+
+        return isset(self::$_presentations['base_id']) ? self::$_presentations['base_id'] : '';
+    }
+
+    public static function getStamp($base_id)
+    {
+        if ( ! isset(self::$_stamps['base_id'])) {
+
+            if (is_file(__DIR__ . '/../../config/stamp/' . $base_id))
+                self::$_stamps['base_id'] = '<img src="/custom/stamp/' . $base_id . '" />';
+        }
+
+        return isset(self::$_stamps['base_id']) ? self::$_stamps['base_id'] : '';
+    }
+
+    public static function purge()
+    {
+        self::$_collections = [];
+    }
+
+    /**
+     * @param  Application $app
+     * @param  int         $base_id
+     * @return collection
+     */
+    public static function getByBaseId(Application $app, $base_id)
+    {
+        /** @var CollectionRepository $repository */
+        $repository = $app['repo.collections'];
+        $collection = $repository->find($base_id);
+
+        if (! $collection) {
+            throw new Exception_Databox_CollectionNotFound(sprintf("Collection with base_id %s could not be found", $base_id));
+        }
+
+        if (!$app['conf.restrictions']->isCollectionAvailable($collection)) {
+            throw new Exception_Databox_CollectionNotFound('Collection `' . $collection->get_base_id() . '` is not available here.');
+        }
+
+        return $collection;
+    }
+
+    /**
+     * @param  Application $app
+     * @param  databox     $databox
+     * @param  int         $coll_id
+     * @return collection
+     */
+    public static function getByCollectionId(Application $app, databox $databox, $coll_id)
+    {
+        assert(is_int($coll_id));
+
+        /** @var CollectionRepository $repository */
+        $repository = $app['repo.collections'];
+        $collection = $repository->findByCollectionId($databox->get_sbas_id(), $coll_id);
+
+        if (! $collection) {
+            throw new Exception_Databox_CollectionNotFound(sprintf("Collection with base_id %s could not be found", $base_id));
+        }
+
+        if (!$app['conf.restrictions']->isCollectionAvailable($collection)) {
+            throw new Exception_Databox_CollectionNotFound('Collection `' . $collection->get_base_id() . '` is not available here.');
+        }
+
+        return $collection;
+    }
+
+    /**
+     * @var CollectionReference
+     */
+    protected $reference;
+
+    /**
+     * @var string
+     */
+    protected $name;
+
+    /**
+     * @var string
+     */
+    protected $preferences;
+
+    /**
+     * @var string
+     */
+    protected $pub_wm;
+
+    /**
+     * @var string[]
+     */
+    protected $labels = [];
+
+    /**
+     * @var databox
+     */
+    protected $databox;
+
+    /**
+     * @var int[]|string
+     */
+    protected $binary_logo;
+
+    /**
+     * @var Application
+     */
+    protected $app;
+
+    public function __construct(Application $app, $baseId, CollectionReference $reference, array $row)
+    {
+        $this->app = $app;
+        $this->databox = $app->getApplicationBox()->get_databox($reference->getDataboxId());
+
+        $this->reference = $reference;
+
+        $this->name = $row['asciiname'];
         $this->available = true;
         $this->pub_wm = $row['pub_wm'];
-        $this->name = $row['asciiname'];
-        $this->prefs = $row['prefs'];
+        $this->preferences = $row['prefs'];
         $this->labels = [
             'fr' => $row['label_fr'],
             'en' => $row['label_en'],
             'de' => $row['label_de'],
             'nl' => $row['label_nl'],
         ];
+    }
 
-        $conn = $this->app->getApplicationBox()->get_connection();
-
-        $sql = 'SELECT server_coll_id, sbas_id, base_id, active, ord FROM bas
-            WHERE server_coll_id = :coll_id AND sbas_id = :sbas_id';
-
-        $stmt = $conn->prepare($sql);
-        $stmt->execute([':coll_id' => $this->coll_id, ':sbas_id' => $this->databox->get_sbas_id()]);
-        $row = $stmt->fetch(PDO::FETCH_ASSOC);
-        $stmt->closeCursor();
-
-        $this->is_active = false;
-
-        if ($row) {
-            $this->is_active = ! ! $row['active'];
-            $this->base_id = (int) $row['base_id'];
-            $this->ord = (int) $row['ord'];
-        }
-
-        $stmt->closeCursor();
-
-        $datas = [
-            'is_active' => $this->is_active
-            , 'base_id'   => $this->base_id
-            , 'available' => $this->available
-            , 'pub_wm'    => $this->pub_wm
-            , 'name'      => $this->name
-            , 'ord'       => $this->ord
-            , 'prefs'     => $this->prefs
-            , 'labels'    => $this->labels
-        ];
-
-        $this->set_data_to_cache($datas);
-
-        return $this;
+    private function dispatch($eventName, CollectionEvent $event)
+    {
+        $this->app['dispatcher']->dispatch($eventName, $event);
     }
 
     public function enable(appbox $appbox)
@@ -162,7 +318,7 @@ class collection implements cache_cacheableInterface, ThumbnailedElement
 
     public function get_ord()
     {
-        return $this->ord;
+        return $this->reference->getDisplayIndex();
     }
 
     public function set_ord($ord)
@@ -171,6 +327,8 @@ class collection implements cache_cacheableInterface, ThumbnailedElement
         $this->delete_data_from_cache();
         $this->app->getApplicationBox()->delete_data_from_cache(appbox::CACHE_LIST_BASES);
 
+        $this->reference->setDisplayIndex($ord);
+
         return $this;
     }
 
@@ -186,6 +344,8 @@ class collection implements cache_cacheableInterface, ThumbnailedElement
         $this->databox->delete_data_from_cache(databox::CACHE_COLLECTIONS);
         cache_databox::update($this->app, $this->databox->get_sbas_id(), 'structure');
 
+        $this->reference->disable();
+
         return $this;
     }
 
@@ -211,9 +371,12 @@ class collection implements cache_cacheableInterface, ThumbnailedElement
         return $this;
     }
 
+    /**
+     * @return bool
+     */
     public function is_active()
     {
-        return $this->is_active;
+        return $this->reference->isActive();
     }
 
     /**
@@ -225,16 +388,26 @@ class collection implements cache_cacheableInterface, ThumbnailedElement
         return $this->databox;
     }
 
+    /**
+     * @return \Doctrine\DBAL\Connection
+     */
     public function get_connection()
     {
         return $this->databox->get_connection();
     }
 
+    /**
+     * @return int
+     */
     public function getRootIdentifier()
     {
-        return $this->base_id;
+        return $this->reference->getBaseId();
     }
 
+    /**
+     * @param string $thumbnailType
+     * @param File $file
+     */
     public function updateThumbnail($thumbnailType, File $file = null)
     {
         switch ($thumbnailType) {
@@ -254,7 +427,6 @@ class collection implements cache_cacheableInterface, ThumbnailedElement
         }
     }
 
-
     public function set_public_presentation($publi)
     {
         if (in_array($publi, ['none', 'wm', 'stamp'])) {
@@ -344,7 +516,6 @@ class collection implements cache_cacheableInterface, ThumbnailedElement
 
     public function get_record_details()
     {
-
         $sql = "SELECT record.coll_id,name,COALESCE(asciiname, CONCAT('_',record.coll_id)) AS asciiname,
                     SUM(1) AS n, SUM(size) AS size
                   FROM record NATURAL JOIN subdef
@@ -386,7 +557,6 @@ class collection implements cache_cacheableInterface, ThumbnailedElement
 
     public function reset_watermark()
     {
-
         $sql = 'SELECT path, file FROM record r INNER JOIN subdef s USING(record_id)
             WHERE r.coll_id = :coll_id AND r.type="image" AND s.name="preview"';
 
@@ -403,7 +573,6 @@ class collection implements cache_cacheableInterface, ThumbnailedElement
 
     public function reset_stamp($record_id = null)
     {
-
         $sql = 'SELECT path, file FROM record r INNER JOIN subdef s USING(record_id)
             WHERE r.coll_id = :coll_id
               AND r.type="image" AND s.name IN ("preview", "document")';
@@ -463,81 +632,38 @@ class collection implements cache_cacheableInterface, ThumbnailedElement
         return $this->binary_logo;
     }
 
-    /**
-     *
-     * @param  Application $app
-     * @param  int         $base_id
-     * @return collection
-     */
-    public static function get_from_base_id(Application $app, $base_id)
-    {
-        $coll_id = phrasea::collFromBas($app, $base_id);
-        $sbas_id = phrasea::sbasFromBas($app, $base_id);
-        if (! $sbas_id || ! $coll_id) {
-            throw new Exception_Databox_CollectionNotFound(sprintf("Collection with base_id %s could not be found", $base_id));
-        }
-        $databox = $app->findDataboxById($sbas_id);
-
-        return self::get_from_coll_id($app, $databox, $coll_id);
-    }
-
-    /**
-     *
-     * @param  Application $app
-     * @param  databox     $databox
-     * @param  int         $coll_id
-     * @return collection
-     */
-    public static function get_from_coll_id(Application $app, databox $databox, $coll_id)
-    {
-        assert(is_int($coll_id));
-
-        $key = sprintf('%d_%d', $databox->get_sbas_id(), $coll_id);
-        if (!isset(self::$_collections[$key])) {
-            $collection = new self($app, $coll_id, $databox);
-
-            if (!$app['conf.restrictions']->isCollectionAvailable($collection)) {
-                throw new Exception_Databox_CollectionNotFound('Collection `' . $collection->get_base_id() . '` is not available here.');
-            }
-
-            self::$_collections[$key] = $collection;
-        }
-
-        return self::$_collections[$key];
-    }
-
     public function get_base_id()
     {
-        return $this->base_id;
+        return $this->reference->getBaseId();
     }
 
     public function get_sbas_id()
     {
-        return $this->sbas_id;
+        return $this->reference->getDataboxId();
     }
 
     public function get_coll_id()
     {
-        return $this->coll_id;
+        return $this->reference->getCollectionId();
     }
 
     public function get_prefs()
     {
-        return $this->prefs;
+        return $this->preferences;
     }
 
     public function set_prefs(DOMDocument $dom)
     {
-        $this->prefs = $dom->saveXML();
+        $this->preferences = $dom->saveXML();
 
         $sql = "UPDATE coll SET prefs = :prefs WHERE coll_id = :coll_id";
         $stmt = $this->get_connection()->prepare($sql);
-        $stmt->execute([':prefs'   => $this->prefs, ':coll_id' => $this->get_coll_id()]);
+        $stmt->execute([':prefs'   => $this->preferences, ':coll_id' => $this->get_coll_id()]);
         $stmt->closeCursor();
 
         $this->delete_data_from_cache();
 
-        return $this->prefs;
+        return $this->preferences;
     }
 
     public function get_name()
@@ -592,73 +718,6 @@ class collection implements cache_cacheableInterface, ThumbnailedElement
         return $this;
     }
 
-    private static function getNewOrder(Connection $conn, $sbas_id)
-    {
-        $sql = "SELECT GREATEST(0, MAX(ord)) + 1 AS ord FROM bas WHERE sbas_id = :sbas_id";
-        $stmt = $conn->prepare($sql);
-        $stmt->execute([':sbas_id' => $sbas_id]);
-        $ord = $stmt->fetch(\PDO::FETCH_ASSOC);
-        $stmt->closeCursor();
-
-        return $ord['ord'] ?: 1;
-    }
-
-    public static function create(Application $app, databox $databox, appbox $appbox, $name, User $user = null)
-    {
-        $sbas_id = $databox->get_sbas_id();
-        $connbas = $databox->get_connection();
-        $conn = $appbox->get_connection();
-        $new_bas = false;
-
-        $prefs = '<?xml version="1.0" encoding="UTF-8"?>
-            <baseprefs>
-                <status>0</status>
-                <sugestedValues>
-                </sugestedValues>
-            </baseprefs>';
-
-        $sql = "INSERT INTO coll (coll_id, asciiname, prefs, logo)
-                VALUES (null, :name, :prefs, '')";
-
-        $params = [
-            ':name' => $name,
-            'prefs'  => $prefs,
-        ];
-
-        $stmt = $connbas->prepare($sql);
-        $stmt->execute($params);
-        $stmt->closeCursor();
-
-        $new_id = (int) $connbas->lastInsertId();
-
-        $sql = "INSERT INTO bas (base_id, active, ord, server_coll_id, sbas_id, aliases)
-            VALUES
-            (null, 1, :ord, :server_coll_id, :sbas_id, '')";
-        $stmt = $conn->prepare($sql);
-        $stmt->execute([
-            ':server_coll_id' => $new_id,
-            ':sbas_id' => $sbas_id,
-            ':ord' => self::getNewOrder($conn, $sbas_id),
-        ]);
-        $stmt->closeCursor();
-
-        $new_bas = $conn->lastInsertId();
-        $databox->delete_data_from_cache(databox::CACHE_COLLECTIONS);
-        $appbox->delete_data_from_cache(appbox::CACHE_LIST_BASES);
-
-        phrasea::reset_baseDatas($appbox);
-
-        $collection = self::get_from_coll_id($app, $databox, $new_id);
-
-        if (null !== $user) {
-            $collection->set_admin($new_bas, $user);
-        }
-
-        $app['dispatcher']->dispatch(CollectionEvents::CREATED, new CreatedEvent($collection));
-
-        return $collection;
-    }
-
     public function set_admin($base_id, User $user)
     {
 
@@ -687,86 +746,6 @@ class collection implements cache_cacheableInterface, ThumbnailedElement
         return true;
     }
 
-    public static function mount_collection(Application $app, databox $databox, $coll_id, User $user)
-    {
-
-        $sql = "INSERT INTO bas (base_id, active, server_coll_id, sbas_id, aliases, ord)
-            VALUES
-            (null, 1, :server_coll_id, :sbas_id, '', :ord)";
-        $stmt = $databox->get_appbox()->get_connection()->prepare($sql);
-        $stmt->execute([
-            ':server_coll_id' => $coll_id,
-            ':sbas_id'        => $databox->get_sbas_id(),
-            ':ord'            => self::getNewOrder($databox->get_appbox()->get_connection(), $databox->get_sbas_id()),
-        ]);
-        $stmt->closeCursor();
-
-        $new_bas = $databox->get_appbox()->get_connection()->lastInsertId();
-        $databox->get_appbox()->delete_data_from_cache(appbox::CACHE_LIST_BASES);
-
-        $databox->delete_data_from_cache(databox::CACHE_COLLECTIONS);
-
-        cache_databox::update($app, $databox->get_sbas_id(), 'structure');
-
-        phrasea::reset_baseDatas($databox->get_appbox());
-
-        $coll = self::get_from_base_id($app, $new_bas);
-        $coll->set_admin($new_bas, $user);
-
-        return $new_bas;
-    }
-
-    public static function getLogo($base_id, Application $app, $printname = false)
-    {
-        $base_id_key = $base_id . '_' . ($printname ? '1' : '0');
-
-        if ( ! isset(self::$_logos[$base_id_key])) {
-
-            if (is_file($app['root.path'] . '/config/minilogos/' . $base_id)) {
-                $name = phrasea::bas_labels($base_id, $app);
-                self::$_logos[$base_id_key] = '<img title="' . $name
-                    . '" src="/custom/minilogos/' . $base_id . '" />';
-            } elseif ($printname) {
-                self::$_logos[$base_id_key] = phrasea::bas_labels($base_id, $app);
-            }
-        }
-
-        return isset(self::$_logos[$base_id_key]) ? self::$_logos[$base_id_key] : '';
-    }
-
-    public static function getWatermark($base_id)
-    {
-        if ( ! isset(self::$_watermarks['base_id'])) {
-
-            if (is_file(__DIR__  . '/../../config/wm/' . $base_id))
-                self::$_watermarks['base_id'] = '<img src="/custom/wm/' . $base_id . '" />';
-        }
-
-        return isset(self::$_watermarks['base_id']) ? self::$_watermarks['base_id'] : '';
-    }
-
-    public static function getPresentation($base_id)
-    {
-        if ( ! isset(self::$_presentations['base_id'])) {
-
-            if (is_file(__DIR__ . '/../../config/presentation/' . $base_id))
-                self::$_presentations['base_id'] = '<img src="/custom/presentation/' . $base_id . '" />';
-        }
-
-        return isset(self::$_presentations['base_id']) ? self::$_presentations['base_id'] : '';
-    }
-
-    public static function getStamp($base_id)
-    {
-        if ( ! isset(self::$_stamps['base_id'])) {
-
-            if (is_file(__DIR__ . '/../../config/stamp/' . $base_id))
-                self::$_stamps['base_id'] = '<img src="/custom/stamp/' . $base_id . '" />';
-        }
-
-        return isset(self::$_stamps['base_id']) ? self::$_stamps['base_id'] : '';
-    }
-
     public function get_cache_key($option = null)
     {
         return 'collection_' . $this->coll_id . ($option ? '_' . $option : '');
@@ -787,11 +766,6 @@ class collection implements cache_cacheableInterface, ThumbnailedElement
         return $this->databox->delete_data_from_cache($this->get_cache_key($option));
     }
 
-    public static function purge()
-    {
-        self::$_collections = [];
-    }
-
     /**
      * Tells whether registration is activated for provided collection or not.
      *
diff --git a/lib/classes/databox.php b/lib/classes/databox.php
index c8e20e22f0..485e8f21d1 100644
--- a/lib/classes/databox.php
+++ b/lib/classes/databox.php
@@ -10,6 +10,7 @@
  */
 
 use Alchemy\Phrasea\Application;
+use Alchemy\Phrasea\Collection\CollectionRepository;
 use Alchemy\Phrasea\Core\Connection\ConnectionSettings;
 use Alchemy\Phrasea\Core\PhraseaTokens;
 use Alchemy\Phrasea\Core\Version\DataboxVersionRepository;
@@ -151,69 +152,30 @@ class databox extends base implements \Alchemy\Phrasea\Core\Thumbnail\Thumbnaile
      */
     public function get_collections()
     {
-        $ret = [];
+        static $collections;
 
-        foreach ($this->get_available_collections() as $coll_id) {
-            $ret[] = collection::get_from_coll_id($this->app, $this, $coll_id);
+        if ($collections === null) {
+            /** @var CollectionRepository $collectionsRepository */
+            $collectionsRepository = $this->app['repo.collections'];
+            $collections = $collectionsRepository->findAllByDatabox($this->get_sbas_id());
         }
 
-        return $ret;
+        return $collections;
     }
 
     public function get_collection_unique_ids()
     {
-        static $base_ids;
+        static $collectionsIds;
 
-        if (isset($base_ids)) {
-            return $base_ids;
-        }
+        if ($collectionsIds === null) {
+            $collectionsIds = [];
 
-        $conn = $this->get_appbox()->get_connection();
-        $sql = "SELECT b.base_id FROM bas b WHERE b.sbas_id = :sbas_id AND b.active = '1' ORDER BY b.ord ASC";
-        $stmt = $conn->prepare($sql);
-        $stmt->execute([':sbas_id' => $this->id]);
-        $rs = $stmt->fetchAll(PDO::FETCH_ASSOC);
-        $stmt->closeCursor();
-
-        $base_ids = [];
-        foreach ($rs as $row) {
-            $base_ids[] = (int) $row['base_id'];
-        }
-
-        return $base_ids;
-    }
-
-    protected function get_available_collections()
-    {
-        try {
-            $data = $this->get_data_from_cache(self::CACHE_COLLECTIONS);
-            if (is_array($data)) {
-                return $data;
+            foreach ($this->get_collections() as $collection) {
+                $collectionsIds[] = $collection->get_base_id();
             }
-        } catch (\Exception $e) {
-
         }
 
-        $conn = $this->get_appbox()->get_connection();
-
-        $sql = "SELECT b.server_coll_id FROM sbas s, bas b
-            WHERE s.sbas_id = b.sbas_id AND b.sbas_id = :sbas_id
-              AND b.active = '1'
-            ORDER BY s.ord ASC, b.ord,b.base_id ASC";
-        $stmt = $conn->prepare($sql);
-        $stmt->execute([':sbas_id' => $this->id]);
-        $rs = $stmt->fetchAll(PDO::FETCH_ASSOC);
-        $stmt->closeCursor();
-
-        $ret = [];
-
-        foreach ($rs as $row) {
-            $ret[] = (int) $row['server_coll_id'];
-        }
-
-        $this->set_data_to_cache($ret, self::CACHE_COLLECTIONS);
-
-        return $ret;
+        return $collectionsIds;
     }
 
     /**
diff --git a/lib/classes/patch/370alpha7a.php b/lib/classes/patch/370alpha7a.php
index f728e2132b..ebd5145426 100644
--- a/lib/classes/patch/370alpha7a.php
+++ b/lib/classes/patch/370alpha7a.php
@@ -110,7 +110,7 @@ class patch_370alpha7a extends patchAbstract
 
                 $media = $app->getMediaFromUri($filePath);
 
-                $collection = \collection::get_from_base_id($app, $row['base_id']);
+                $collection = \collection::getByBaseId($app, $row['base_id']);
 
                 $borderFile = new \Alchemy\Phrasea\Border\File($app, $media, $collection);
 
diff --git a/lib/classes/patch/390alpha13a.php b/lib/classes/patch/390alpha13a.php
index d0b7ca7118..3b96e50b46 100644
--- a/lib/classes/patch/390alpha13a.php
+++ b/lib/classes/patch/390alpha13a.php
@@ -91,7 +91,7 @@ class patch_390alpha13a implements patchInterface
             }
 
             try {
-                $collection = \collection::get_from_base_id($app, $row['base_id']);
+                $collection = \collection::getByBaseId($app, $row['base_id']);
             } catch (\Exception $e) {
                 $app['monolog']->addInfo(sprintf(
                     'Patch %s : Registration for user (%s) could not be turn into doctrine entity as base with id (%s) could not be found.',
diff --git a/lib/classes/record/adapter.php b/lib/classes/record/adapter.php
index 37b0cd18df..d155ab7ce9 100644
--- a/lib/classes/record/adapter.php
+++ b/lib/classes/record/adapter.php
@@ -300,7 +300,7 @@ class record_adapter implements RecordInterface, cache_cacheableInterface
      */
     public function get_collection()
     {
-        return \collection::get_from_coll_id($this->app, $this->databox, $this->collection_id);
+        return \collection::getByCollectionId($this->app, $this->databox, $this->collection_id);
     }
 
     /**
diff --git a/tests/Alchemy/Tests/Phrasea/Controller/Admin/AdminCollectionTest.php b/tests/Alchemy/Tests/Phrasea/Controller/Admin/AdminCollectionTest.php
index f1a9d3e801..5ad9553753 100644
--- a/tests/Alchemy/Tests/Phrasea/Controller/Admin/AdminCollectionTest.php
+++ b/tests/Alchemy/Tests/Phrasea/Controller/Admin/AdminCollectionTest.php
@@ -154,7 +154,7 @@ class AdminCollectionTest extends \PhraseanetAuthenticatedWebTestCase
         $json = $this->getJson(self::$DI['client']->getResponse());
         $this->assertTrue($json->success);
 
-        $collection = $collection = \collection::get_from_base_id(self::$DI['app'], self::$DI['collection']->get_base_id());
+        $collection = $collection = \collection::getByBaseId(self::$DI['app'], self::$DI['collection']->get_base_id());
         $this->assertTrue( ! ! strrpos($collection->get_prefs(), 'my_new_value'));
         unset($collection);
     }
@@ -212,7 +212,7 @@ class AdminCollectionTest extends \PhraseanetAuthenticatedWebTestCase
         $json = $this->getJson(self::$DI['client']->getResponse());
         $this->assertTrue($json->success);
 
-        $collection = \collection::get_from_base_id(self::$DI['app'], self::$DI['collection']->get_base_id());
+        $collection = \collection::getByBaseId(self::$DI['app'], self::$DI['collection']->get_base_id());
         $this->assertTrue($collection->is_active());
         unset($collection);
     }
@@ -252,7 +252,7 @@ class AdminCollectionTest extends \PhraseanetAuthenticatedWebTestCase
 
         $json = $this->getJson(self::$DI['client']->getResponse());
         $this->assertTrue($json->success);
-        $collection = \collection::get_from_base_id(self::$DI['app'], self::$DI['collection']->get_base_id());
+        $collection = \collection::getByBaseId(self::$DI['app'], self::$DI['collection']->get_base_id());
         $this->assertFalse($collection->is_active());
         unset($collection);
     }
@@ -335,7 +335,7 @@ class AdminCollectionTest extends \PhraseanetAuthenticatedWebTestCase
 
         $json = $this->getJson(self::$DI['client']->getResponse());
         $this->assertTrue($json->success);
-        $collection = \collection::get_from_base_id(self::$DI['app'], self::$DI['collection']->get_base_id());
+        $collection = \collection::getByBaseId(self::$DI['app'], self::$DI['collection']->get_base_id());
         $this->assertNotNull($collection->get_pub_wm());
         unset($collection);
     }
@@ -832,7 +832,7 @@ class AdminCollectionTest extends \PhraseanetAuthenticatedWebTestCase
         $json = $this->getJson(self::$DI['client']->getResponse());
         $this->assertTrue($json->success);
         try {
-            \collection::get_from_base_id(self::$DI['app'], $collection->get_base_id());
+            \collection::getByBaseId(self::$DI['app'], $collection->get_base_id());
             $this->fail('Collection not deleted');
         } catch (\Exception $e) {
 
@@ -902,7 +902,7 @@ class AdminCollectionTest extends \PhraseanetAuthenticatedWebTestCase
         $this->assertTrue($json->success);
 
         try {
-            \collection::get_from_base_id(self::$DI['app'], $collection->get_base_id());
+            \collection::getByBaseId(self::$DI['app'], $collection->get_base_id());
             $this->fail('Collection not unmounted');
         } catch (\Exception_Databox_CollectionNotFound $e) {
 
diff --git a/tests/classes/ACLTest.php b/tests/classes/ACLTest.php
index f73248c905..e259569347 100644
--- a/tests/classes/ACLTest.php
+++ b/tests/classes/ACLTest.php
@@ -494,7 +494,7 @@ class ACLTest extends \PhraseanetTestCase
 
         foreach ($bases as $base_id) {
             try {
-                $collection = collection::get_from_base_id(self::$DI['app'], $base_id);
+                $collection = collection::getByBaseId(self::$DI['app'], $base_id);
                 $this->assertTrue($collection instanceof collection);
                 $this->assertEquals($base_id, $collection->get_base_id());
                 unset($collection);
diff --git a/tests/classes/PhraseanetTestCase.php b/tests/classes/PhraseanetTestCase.php
index da52f18e1e..16b81f8710 100644
--- a/tests/classes/PhraseanetTestCase.php
+++ b/tests/classes/PhraseanetTestCase.php
@@ -196,15 +196,15 @@ abstract class PhraseanetTestCase extends WebTestCase
         });
 
         self::$DI['collection'] = self::$DI->share(function ($DI) {
-            return collection::get_from_base_id($DI['app'], self::$fixtureIds['collection']['coll']);
+            return collection::getByBaseId($DI['app'], self::$fixtureIds['collection']['coll']);
         });
 
         self::$DI['collection_no_access'] = self::$DI->share(function ($DI) {
-            return collection::get_from_base_id($DI['app'], self::$fixtureIds['collection']['coll_no_access']);
+            return collection::getByBaseId($DI['app'], self::$fixtureIds['collection']['coll_no_access']);
         });
 
         self::$DI['collection_no_access_by_status'] = self::$DI->share(function ($DI) {
-            return collection::get_from_base_id($DI['app'], self::$fixtureIds['collection']['coll_no_status']);
+            return collection::getByBaseId($DI['app'], self::$fixtureIds['collection']['coll_no_status']);
         });
 
         self::$DI['lazaret_1'] = self::$DI->share(function ($DI) {
diff --git a/tests/classes/collectionTest.php b/tests/classes/collectionTest.php
index 97709f5741..7bc607cd76 100644
--- a/tests/classes/collectionTest.php
+++ b/tests/classes/collectionTest.php
@@ -175,7 +175,7 @@ class collectionTest extends \PhraseanetTestCase
 
     public function testGet_from_coll_id()
     {
-        $temp_coll = collection::get_from_coll_id(self::$DI['app'], self::$object->get_databox(), self::$object->get_coll_id());
+        $temp_coll = collection::getByCollectionId(self::$DI['app'], self::$object->get_databox(), self::$object->get_coll_id());
         $this->assertEquals(self::$object->get_coll_id(), $temp_coll->get_coll_id());
         $this->assertEquals(self::$object->get_base_id(), $temp_coll->get_base_id());
     }