App.PostsController = Ember.ArrayController.extend({
  actions: {
    fetchPosts: function (id) {
      var data = App.Post.find({category: id});
      this.set('model', data);
    },
    add: function () {
      var post = this.get('newPost');
      post.save().then(function () {
        this.pushObject(post);
      });
   }
});