code: function wrapComplete(instance, options) {
  	var complete = options.complete;
  
  	options.complete = function(response) {
  		if ( _.isFunction( complete ) ) {
  			complete.call( this, instance, response, options );
  		}
  	};
  }
docs: Wraps the complete callback function inside another function to ensure it is executed with the right arguments.
  
  @param {Backbone.DynamoDB.Model} instance
  @param {Object} options