(diff-array): Update the use of diffQueryOrderedChanges after minimongo separation in Meteor 1.2

Author: Urigo

lib/diff-array.js

@@ -10,9 +10,15 @@ module.factory('diffArray', ['getUpdates',
     // Calculates the differences between `lastSeqArray` and
     // `seqArray` and calls appropriate functions from `callbacks`.
     // Reuses Minimongo's diff algorithm implementation.
+    // XXX Should be replaced with the original diffArray function here:
+    // https://github.com/meteor/meteor/blob/devel/packages/observe-sequence/observe_sequence.js#L152
+    // When it will become nested as well, tracking here: https://github.com/meteor/meteor/issues/3764
     function diffArray(lastSeqArray, seqArray, callbacks, preventNestedDiff) {
       preventNestedDiff = !!preventNestedDiff;
-      var diffFn = Package.minimongo.LocalCollection._diffQueryOrderedChanges;
+
+      var diffFn = Package.minimongo.LocalCollection._diffQueryOrderedChanges ||
+        Package['diff-sequence'].DiffSequence.diffQueryOrderedChanges;
+
       var oldObjIds = [];
       var newObjIds = [];
       var posOld = {}; // maps from idStringify'd ids

package.js

@@ -31,12 +31,16 @@ Package.on_use(function (api) {
 
   api.use('angular:angular@1.4.4', 'client');
   api.use('minimongo');
+  // Since commit b3096e93661bc79bab73a63bae0e14643030a9a3, MongoId and
+  // diff-sequence are separate packages from minimongo.
+  // We need to use it for idParse, idStringify and diffQueryOrderedChanges
+  // in lib/diff-array.js
+  if (Package['diff-sequence']) {
+    api.use('diff-sequence');
+  }
   if (Package['mongo-id']) {
-    // Since commit b3096e93661bc79bab73a63bae0e14643030a9a3, MongoId is
-    // in a separate package. We need to use it for idParse and idStringify.
     api.use('mongo-id');
   }
-  api.use('observe-sequence');
   api.use('dburles:mongo-collection-instances@0.3.4', 'client'); // For getCollectionByName
 
   // Files to load in Client only.