Collections handling example with Backbone

router.js

var router = Backbone.Router.extend({
  
  initialize: function (options) {
    this.collections = [];
  },
  
  routes: {
    'new': 'newColl',
    'show/:id': 'showColl'
  },
  
  newColl: function () {
    var collection = this.createCollection();
    var view = new NewCollView({
      collection: collection
    });
    view.render();
  },
  
  showColl: function (id) {
    var collection = this.getCollection(id);
    var view = new ShowCollView({
      collection: collection
    });
    view.render();
  }
  
  // Helpers
  getCollection: function(id) {
    return this.collections[id];
  },
  
  createCollection: function(options) {
    var newCollection = new Collection(options);
    this.collections.push(newCollection);
    newCollection.id = this.collections.indexOf(newCollection);
    return newCollection;
  }

});