assets/js/vendor/backbone-relational.js
function( type, item ) {
			var id = this.resolveIdForItem( type, item );
			var coll = this.getCollection( type );

			// Because the found object could be of any of the type's superModel
			// types, only return it if it's actually of the type asked for.
			if ( coll ) {
				var obj = coll.get( id );

				if ( obj instanceof type ) {
					return obj;
				}
			}

			return null;
		}
function( type, item ) {
			var id = this.resolveIdForItem( type, item );
			var coll = this.getCollection( type );

			// Because the found object could be of any of the type's superModel
			// types, only return it if it's actually of the type asked for.
			if ( coll ) {
				var obj = coll.get( id );

				if ( obj instanceof type ) {
					return obj;
				}
			}

			return null;
		}
Find a specific model of a certain `type` in the store
@param type
@param {String|Number|Object|Backbone.RelationalModel} item