fist mongoose model with some methods (probably not working)

app.js

@@ -10,17 +10,6 @@ var tasks = require('./models/tasks').tasks();
 var mongoose = require('mongoose');
 var db = mongoose.connect('mongodb://localhost/tracker');
 
-var Schema = mongoose.Schema
-  , ObjectId = Schema.ObjectId;
-
-var Task = new Schema({
-    author    : ObjectId
-  , title     : String
-});
-
-
-
-
 var app = module.exports = express.createServer();
 
 // Configuration
@@ -52,9 +41,10 @@ app.get('/', function(req, res) {
 
 
 app.post('/tasks', function(req, res) {
-    var lastId = tasks.add(req.body.title);
-
-    okWithJSON(res, lastId);
+    tasks.create(req.body.title, function(error){
+        // todo do how to get id?
+        okWithJSON(res, lastId);
+    });
 });
 
 app.get('/tasks', function(req, res) {

models/tasks.js

@@ -1,14 +1,29 @@
+var mongoose = require('mongoose');
+
+var Schema = mongoose.Schema, ObjectId = Schema.ObjectId;
+
+var Task = new Schema({
+    id: ObjectId,
+    title: String
+});
+
+mongoose.model('Task', Task);
+
+
 exports.tasks = function() {
     var datastore = [];
 
     return {
-        add: function(title) {
-            datastore.push({id: datastore.length, title: title, completed: false});
-            return datastore.length - 1;
+        create: function(title, callback) {
+            var Task = mongoose.model('Task');
+            var task = new Task();
+            task.title = title;
+            task.save(callback);
         },
 
         getAll: function() {
             return datastore;
         }
     }
-}
+};
+

tests/models/tasks-model-tests.js

@@ -9,7 +9,7 @@ var taskModel = require('../../models/tasks').tasks;
 
 (function shouldHaveOneTaskAfterAddition() {
     var tasks = taskModel();
-    tasks.add('title');
+    tasks.create('title');
 
     assert.equal(tasks.getAll().length, 1)
     assert.equal(tasks.getAll()[0].title, 'title');
@@ -18,7 +18,7 @@ var taskModel = require('../../models/tasks').tasks;
 
 (function getTaskshouldReturnExistingTask() {
     var tasks = taskModel();
-    tasks.add('title');
+    tasks.create('title');
 
     assert.equal(tasks.getAll().length, 1)
 })();