ember.js - What is the purpose of the Ember.Container

Question

Can anyone explain what the purpose of the Container module is in the latest Ember?

An example of its usage, in the setup and in the start of this test:

module("Ember.View - handlebars integration", {
  setup: function() {
    Ember.lookup = lookup = { Ember: Ember };
    lookup.TemplateTests = TemplateTests = Ember.Namespace.create();

    container = new Ember.Container();
    container.optionsForType('template', { instantiate: false });
  }

test("template view should call the function of the associated template", function() {
  container.register('template', 'testTemplate', Ember.Handlebars.compile("<h1 id='twas-called'>template was called</h1>"));

Answer 1

The goal of the container is to provide a more general-purpose mechanism for describing module dependencies than the ad-hoc approach we had been using.

For example, imagine you want to find the controller for the post route. The default Ember rules are that we would look it up as App.PostController. Before the container, we would just hardcode those rules wherever we needed to do the lookup (using classify and friends).

The container provides a way for us to define those rules in a single place. As a bonus, the rules can be overridden for applications that want a different convention.

So instead of Ember.get(namespace, Ember.String.classify(name) + 'Controller') internally, we now do container.lookup('controller:' + name).