如何从控制器获取固定装置中的记录总数？

Question

I'd like to get the total number of records in my fixture from my controller. Here is my fixture code:

FIXTURE

App.Items.FIXTURES = [
 {
    id: 1
 },
 {
    id: 2
 },
 {
    id: 3,
 }
];

In this case, there are 3 total records in the fixture. How do I get that total in my controller?

Answer 1

If you are using something like this:

App.ItemsRoute = Ember.Route.extend({
  model: function() {
      return this.store.find('items');
  } 
});

The store.find returns a Ember.PromiseProxyMixin instance, so you can observe the isFulfilled property to know when the data is loaded:

App.ItemsController = Ember.ArrayController.extend({
    doSomethingWithTotal: function() {        
        var length = this.get('model.length');
        // do something with de length
    }.observes('model.isFulfilled')
});

Like this sample http://jsfiddle.net/marciojunior/UeCWV/

Answer 2

You can ask ArrayController for the property content and it will return an array, which gives you access to length .

Here's an updated Fiddle: http://jsfiddle.net/bYSjD/

App.ItemsController = Ember.ArrayController.extend({
  doSomethingWithTotal: function() {
    return this.get('content.length')
  }.property('content')
});

The way this works is that App.ItemsRoute . model returns a Promise to find items, and when that completes, another method of ItemsRoute is called: setupController .

Ember will automatically handle setupController for you, which populates a controller with the returned model data. The content property of ItemsController will be set, giving your property doSomethingWithTotal a real value.