added aggregate function for RemoteData arrays

src/app/core/cache/builders/remote-data-build.service.ts

@@ -153,4 +153,45 @@ export class RemoteDataBuildService {
     const domainModel = getMapsTo(normalized.constructor);
     return Object.assign(new domainModel(), normalized, links);
   }
+
+  aggregate<T>(input: RemoteData<T>[]): RemoteData<T[]> {
+    const requestPending: Observable<boolean> = <Observable<boolean>> Observable.combineLatest(
+      ...input.map(rd => rd.isRequestPending),
+      (...pendingArray) => pendingArray.every(e => e === true)
+    ).distinctUntilChanged();
+    const responsePending: Observable<boolean> = <Observable<boolean>> Observable.combineLatest(
+      ...input.map(rd => rd.isResponsePending),
+      (...pendingArray) => pendingArray.every(e => e === true)
+    ).distinctUntilChanged();
+    const isSuccessFul: Observable<boolean> = <Observable<boolean>> Observable.combineLatest(
+      ...input.map(rd => rd.hasSucceeded),
+      (...successArray) => successArray.every(e => e === true)
+    ).distinctUntilChanged();
+    const errorMessage: Observable<string> = <Observable<string>> Observable.combineLatest(
+      ...input.map(rd => rd.errorMessage),
+      (...errors) => errors
+        .map((e, idx) => {
+          if (hasValue(e)) {
+            return `[${idx}]: ${e}`;
+          }
+        })
+        .filter(e => hasValue(e))
+        .join(", ")
+    );
+    const payload = <Observable<T[]>> Observable.combineLatest(
+      ...input.map(rd => rd.payload)
+    );
+
+    return new RemoteData(
+      // This is an aggregated object, it doesn't necessarily correspond
+      // to a single REST endpoint, so instead of a self link, use the
+      // current time in ms for a somewhat unique id
+      `${new Date().getTime()}`,
+      requestPending,
+      responsePending,
+      isSuccessFul,
+      errorMessage,
+      payload
+    );
+  }
 }

yarn.lock

@@ -301,14 +301,10 @@ alphanum-sort@^1.0.1, alphanum-sort@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/alphanum-sort/-/alphanum-sort-1.0.2.tgz#97a1119649b211ad33691d9f9f486a8ec9fbe0a3"
 
-amdefine@1.0.0:
+amdefine@1.0.0, amdefine@>=0.0.4:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/amdefine/-/amdefine-1.0.0.tgz#fd17474700cb5cc9c2b709f0be9d23ce3c198c33"
 
-amdefine@>=0.0.4:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/amdefine/-/amdefine-1.0.1.tgz#4a5282ac164729e93619bcfd3ad151f817ce91f5"
-
 angular2-express-engine@2.1.0-rc.1:
   version "2.1.0-rc.1"
   resolved "https://registry.yarnpkg.com/angular2-express-engine/-/angular2-express-engine-2.1.0-rc.1.tgz#79c8e481cde7ff1253b373cbf98de7c9fab4f215"
@@ -3521,11 +3517,7 @@ lowercase-keys@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/lowercase-keys/-/lowercase-keys-1.0.0.tgz#4e3366b39e7f5457e35f1324bdf6f88d0bfc7306"
 
-lru-cache@2:
+lru-cache@2, lru-cache@2.2.x:
-  version "2.7.3"
-  resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-2.7.3.tgz#6d4524e8b955f95d4f5b58851ce21dd72fb4e952"
-
-lru-cache@2.2.x:
   version "2.2.4"
   resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-2.2.4.tgz#6c658619becf14031d0d0b594b16042ce4dc063d"
 
@@ -4659,14 +4651,10 @@ punycode@^1.2.4, punycode@^1.4.1:
   version "1.4.1"
   resolved "https://registry.yarnpkg.com/punycode/-/punycode-1.4.1.tgz#c0d5a63b2718800ad8e1eb0fa5269c84dd41845e"
 
-q@1.4.1:
+q@1.4.1, q@^1.1.2, q@^1.4.1:
   version "1.4.1"
   resolved "https://registry.yarnpkg.com/q/-/q-1.4.1.tgz#55705bcd93c5f3673530c2c2cbc0c2b3addc286e"
 
-q@^1.1.2, q@^1.4.1:
-  version "1.5.0"
-  resolved "https://registry.yarnpkg.com/q/-/q-1.5.0.tgz#dd01bac9d06d30e6f219aecb8253ee9ebdc308f1"
-
 qjobs@^1.1.4:
   version "1.1.5"
   resolved "https://registry.yarnpkg.com/qjobs/-/qjobs-1.1.5.tgz#659de9f2cf8dcc27a1481276f205377272382e73"
@@ -5063,13 +5051,13 @@ right-align@^0.1.1:
   dependencies:
     align-text "^0.1.1"
 
-rimraf@2, rimraf@^2.2.8, rimraf@^2.5.1, rimraf@^2.5.2, rimraf@^2.6.0, rimraf@^2.6.1:
+rimraf@2, rimraf@^2.2.8, rimraf@^2.4.4, rimraf@^2.5.1, rimraf@^2.5.2, rimraf@^2.6.0, rimraf@^2.6.1:
   version "2.6.1"
   resolved "https://registry.yarnpkg.com/rimraf/-/rimraf-2.6.1.tgz#c2338ec643df7a1b7fe5c54fa86f57428a55f33d"
   dependencies:
     glob "^7.0.5"
 
-rimraf@2.5.4, rimraf@^2.4.4:
+rimraf@2.5.4:
   version "2.5.4"
   resolved "https://registry.yarnpkg.com/rimraf/-/rimraf-2.5.4.tgz#96800093cbf1a0c86bd95b4625467535c29dfa04"
   dependencies: