fix(mongoose): support passing options object to Mongoose constructor

Fix #8144

lib/index.js

@@ -56,19 +56,22 @@ require('./helpers/printJestWarning');
  *     const m = new mongoose.Mongoose();
  *
  * @api public
+ * @param {Object} options see [`Mongoose#set()` docs](/docs/api/mongoose.html#mongoose_Mongoose-set)
  */
 function Mongoose(options) {
   this.connections = [];
   this.models = {};
   this.modelSchemas = {};
   // default global options
-  this.options = {
+  this.options = Object.assign({
     pluralization: true
-  };
+  }, options);
   const conn = this.createConnection(); // default connection
   conn.models = this.models;
 
-  this._pluralize = legacyPluralize;
+  if (this.options.pluralization) {
+    this._pluralize = legacyPluralize;
+  }
 
   // If a user creates their own Mongoose instance, give them a separate copy
   // of the `Schema` constructor so they get separate custom types. (gh-6933)

test/index.test.js

@@ -121,6 +121,12 @@ describe('mongoose module:', function() {
     done();
   });
 
+  it('options object (gh-8144)', function() {
+    const mongoose = new Mongoose({ bufferCommands: false });
+
+    assert.strictEqual(mongoose.options.bufferCommands, false);
+  });
+
   it('bufferCommands option (gh-5879)', function(done) {
     const mongoose = new Mongoose();