Various robustness fixes.

Author: pmcnr-hx

lib/mongoHandler.js

@@ -148,17 +148,17 @@ MongoStore._unknownError = function(err) {
 };
 
 MongoStore.prototype._createIndexesForRelationships = function(collection, relationshipAttributeNames) {
-  if (!(relationshipAttributeNames instanceof Array) || !relationshipAttributeNames.length) { return }
+  if (!Array.isArray(relationshipAttributeNames) || !relationshipAttributeNames.length) return;
 
   var index = relationshipAttributeNames.reduce(function(partialIndex, name) {
     if (name) {
-      partialIndex.push([name + ".id", 1]);
+      partialIndex[name + ".id"] = 1;
     }
-
     return partialIndex;
-  }, []);
-
-  collection.ensureIndex(index);
+  }, {});
+  if (Object.keys(index).length) {
+    collection.createIndex(index);
+  }
 };
 
 MongoStore.prototype._applySort = function(request, cursor) {