Add admin field application

www/scripts/apps/admin/fields/collections/fields.js

@@ -1,11 +1,58 @@
 define([
     'underscore',
     'backbone',
-    'models/admin/field'
+    'models/field'
 ], function(_, Backbone, FieldModel) {
     var FieldCollection = Backbone.Collection.extend({
+        initialize: function(models, options) {
+            if (!"sbas_id" in options) {
+                throw "You must specify a sbasId option when creating a new field model"
+            }
+            this.sbasId = options.sbas_id;
+        },
         model: FieldModel,
-        url: '/admin/fields/1/fields'
+        url: function() {
+            return '/admin/fields/' + this.sbasId + '/fields';
+        },
+        search: function(letters) {
+            if (letters === "")
+                return this;
+
+            var pattern = new RegExp(letters, "gi");
+
+            return _(this.filter(function(data) {
+                return pattern.test(data.get("name"));
+            }));
+        },
+        comparator: function(item) {
+            return item.get("sorter");
+        },
+        nextIndex: function(model) {
+            var index = this.indexOf(model);
+
+            if (index < 0) {
+                throw "Model not found"
+            }
+
+            if ((index + 1) === this.length) {
+                return null;
+            }
+
+            return index + 1;
+        },
+        previousIndex: function(model) {
+            var index = this.indexOf(model);
+
+            if (index < 0) {
+                throw "Model not found"
+            }
+
+            if (index === 0) {
+                return null;
+            }
+
+            return index - 1;
+        }
     });
 
     return FieldCollection;