An Ember.js Collection view which has childViews depending on a property of the data row.

multiplexing_collection.js

FS.MultiplexingCollectionView = Em.CollectionView.extend({
  itemViewClass: Em.View,
  
  typeProperty: "type",
  viewMap: {},
  
  createChildView: function(view, attrs) {
    var map = this.get("viewMap");
    var prop = this.get("typeProperty");
    
    if (attrs.content[prop] && (klassName = map[attrs.content[prop]])) {
      view = Ember.getPath(klassName);
    }
    
    return this._super(view, attrs)
  }
});

FS.SlidesCollectionView = FS.MultiplexingCollectionView.extend({
  typeProperty: "type",
  viewMap: {
    interstitial: "FS.InterstitialView",
    grid:         "FS.GridView",
    leader_board:  "FS.LeaderboardSlideView"
  }
});