MongooseFiltering class

Cleaned up the implementation of the MongooseFiltering service class.

Previously, the service definition was inside an IIFE which returned the
function object representing the class. This way of doing it ins't
recommended.

This new implementation properly sets the prototype of the function
object used to declare the service.

modules/core/server/controllers/mongoose-filtering.server.controller.js

@@ -1,32 +1,32 @@
-// Service for managing Filtering/Parameterized-Queries.
-
-var service = (function () {
-  function service(query, options) {
-    this._query = query;
-    this._modifiedQuery = null;
-    this._totalDocumentCount = null;
-    this._page = options.page ? Math.max(0, options.page - 1) : null;
-    this._take = options.take && options.take >= 0 ? options.take : null;
-    this._filters = Array.isArray(options.filters) ? options.filters : [];
-    this._sorting = options.sorting && options.sorting.length ? options.sorting : null;
-
-    if (this._take > 300) {
-      // Provide a default take.
-      // This should probably be in the env configs.
-      this._take = 50;
-    }
+// Service for managing filtering, sorting, and pagination of
+// Mongoose queries.
+function MongooseFiltering(query, options) {
+  options = options || {};
+
+  this._query = query || null;
+  this._modifiedQuery = null;
+  this._totalDocumentCount = null;
+  this._page = options.page ? Math.max(0, options.page - 1) : null;
+  this._take = options.take && options.take >= 0 ? options.take : null;
+  this._filters = Array.isArray(options.filters) ? options.filters : [];
+  this._sorting = options.sorting && options.sorting.length ? options.sorting : null;
+
+  if (this._take > 300) {
+    // Provide a default take.
+    // This should probably be in the env configs.
+    this._take = 50;
   }
+}
 
-  service.prototype.pageSortFilter = pageSortFilter;
-
-  return service;
-}());
+MongooseFiltering.prototype.pageSortFilter = pageSortFilter;
 
+// Perform Pagination, Sorting, and Filtering on the current
+// class instance. Uses the Mongoose query stored in the class
+// instance's _query property.
 function pageSortFilter(performCountQuery) {
   var self = this;
 
   return new Promise(function (resolve, reject) {
-
     // Add sorting to the query if specified
     self._modifiedQuery = sort(self._query, self._sorting);
 
@@ -100,4 +100,4 @@ function filter(query, filters) {
   return query;
 }
 
-module.exports = service;
+module.exports = MongooseFiltering;