MongoClient.patch

diff --git a/day3/app.js b/day3/app.js
index 637f47f..a9a5700 100644
--- a/day3/app.js
+++ b/day3/app.js
@@ -6,6 +6,7 @@
 const express    = require('express');
 const bodyParser = require('body-parser');
 const mongoose   = require("mongoose");
+const MongoClient = require("mongodb").MongoClient;
 /* our applications modules */
 const Post = require("./models/post");
 
@@ -19,16 +20,17 @@ app.locals.databases = {
     development: 'mongodb://localhost/yabe-development',
     testing:     'mongodb://localhost/yabe-testing',
 };
-/* mongoose & MongoDB stuff */
-mongoose.Promise = global.Promise; // Use native promises
-const is_development = (process.env.NODE_ENV === 'development');
-mongoose.set('debug', is_development);
 /* mongoose connection */
-app.locals.connect = function () {
+app.locals.connect = function (callback) {
     const env      = process.env.NODE_ENV;
     const database = app.locals.databases[env];
     console.log(`NODE_ENV=${env}, connecting to ${database}`);
-    return mongoose.connect(database, {useMongoClient: true});
+    MongoClient.connect(database, function(err, db) {
+        if (err)
+            return callback(err);
+        app.locals.db = db;
+        return callback();
+    });
 };
 
 /* setup */
@@ -39,8 +41,10 @@ app.use(bodyParser.urlencoded({extended: false}))
 app.post("/api/posts", function (req, res, next) {
     const input = req.body;
     // app.locals.posts.push(input);
-    Post.create(input).catch(next).then(created => {
-        return res.status(201 /* Created */).send(created);
+    app.locals.db.collection('posts').insertOne(input, (err, result) => {
+        if (err)
+            return next(err);
+        return res.status(201 /* Created */).send(result.ops[0]);
     });
 });
 
diff --git a/day3/index.js b/day3/index.js
index c9523c3..754395f 100644
--- a/day3/index.js
+++ b/day3/index.js
@@ -6,7 +6,7 @@
 const app = require("./app");
 
 // launch our application
-app.locals.connect().then(() => {
+app.locals.connect(err => {
     console.log(app.locals.name + ' connected to MongoDB');
     app.listen(app.locals.port, function () {
         console.log(app.locals.name + ' listening on port ' + app.locals.port);
diff --git a/day3/package.json b/day3/package.json
index c9ac612..0345384 100644
--- a/day3/package.json
+++ b/day3/package.json
@@ -13,6 +13,7 @@
   "dependencies": {
     "body-parser": "^1.17.2",
     "express": "^4.15.3",
+    "mongodb": "^2.2.30",
     "mongoose": "^4.11.1"
   },
   "devDependencies": {