MEM-548 Collections (info panel) do not get updated when removed from…

modules/documents/client/directives/documents.manager.directive.js

@@ -804,11 +804,20 @@ angular.module('documents')
 						// Removal - check main and other documents
 						promises = _.union(_.map(added, function(c) {
 							return CollectionModel.addOtherDocument(c._id, documents._id);
-						}), _.map(removed, function(c) {
-							return CollectionModel.removeOtherDocument(c._id, documents._id);
 						}), _.map(removed, function(c) {
 							return CollectionModel.removeMainDocument(c._id, documents._id);
 						}));
+						// EPIC - 1215 Collections (info panel) do not get updated when removed from the document
+						// Dealing seperately with removal of documents (associated with the appropriate collections) here 
+						// because saving documents after removing collections
+						// does not take into consideration the fact that the collections could be updated by something else
+						//Therefore, we serialize promises such that removal of one document only happens after the removal of another document.
+						var chain = _.reduce(removed, function(previousPromise, currentCollectionElement) {
+							return previousPromise.then(function() {
+								return CollectionModel.removeOtherDocument(currentCollectionElement._id, documents._id);
+							});
+						}, Promise.resolve());
+						promises.push(chain);
 
 						return Promise.all(promises).then(function() {
 							AlertService.success('The document\'s collections were successfully updated.');