title: Ember-Data callback when findAll finished loading all records
body: <p>With ember-data I'm loading all records of a model with:</p>
  
  <pre><code>App.adapter = DS.Adapter.create({
    findAll: function(store, type) {
        var url = type.url;
        jQuery.getJSON(url, function(data) {
            var ids = data.map(function(item, index, self){ return item.id });
            store.loadMany(type, ids, data);
        });
    }
  });
  </code></pre>
  
  <p>The <code>didLoad</code> method is called when each of the record has finished loading. Is there a method to call when <strong>all</strong> records have finished loading? </p>
  
  <hr>
  
  <p>EDIT</p>
  
  <p>Model:</p>
  
  <pre><code>App.Article  = DS.Model.extend({
  
    title: DS.attr('string'),
    content: DS.attr('string'),
  
  
    checkIsLoaded: function() {
        if (this.get('isLoaded')){
           console.log('loaded!'); // outputs `loaded` for each record
        }
    }.observes('isLoaded')
  
  });
  </code></pre>