Ember.js：“ init”挂钩在ObjectController上被调用了两次

Question

I was fiddling around with Ember and I came across something that confused me.

I have an ArrayController ( Index ) with an item controller ( Post ). For the init hook on the Post item controller, I have it send a debug line out to the console. This debug statement is being sent twice for each post, and I can't figure out why.

Code on JSBin: http://emberjs.jsbin.com/momikuto/14/edit

HTML:

<script type="text/x-handlebars">
  {{outlet}}
</script>

<script type="text/x-handlebars" data-template-name="index">
  {{each controller itemViewClass="App.PostView"}}
</script>

<script type="text/x-handlebars" data-template-name="post">
  POST {{id}}<br />
</script>

JavaScript:

App = Ember.Application.create();

App.IndexController = Ember.ArrayController.extend({
  itemController: 'post',
  templateName: 'index',

  addPost: function (id) {
    this.pushObject(App.PostController.create({ id: id }));
  }
});

App.PostController = Ember.ObjectController.extend({
  debug: function () {
    console.log('init for post ' + this.get('id'));
  }.on('init')
});

App.IndexView = Ember.View.extend({
  didInsertElement: function () {
    this.get('controller').addPost(1);
    this.get('controller').addPost(2);
  }
});

App.PostView = Ember.View.extend({
  tagName: 'span',
  templateName: 'post'
});

Output:

init for post 1
init for post 1
init for post 2
init for post 2

If I remove post 2 and only use post 1, I just get init for post 1 twice. If I add a post, I get all three of them twice. The number of Post objects in the ArrayControl does not seem to have anything to do with the problem.

---

I saw one post on the Ember Github, but it was closed after it was assumed to not be an Ember issue. Any ideas?

Answer 1

You're creating it twice. You have itemController set on your IndexController and you're actually creating the controller in the addPost function.

You shouldn't ever need to create a controller instance yourself, except for some strange edge cases. Ember will create the itemControler instance for you when you pushObject so you don't need to manually create .