code: function (el) {
  			var value = can.trim(el.val()),
  				todo = el.closest('.todo').data('todo');
  
  			// If we don't have a todo we don't need to do anything
  			if (!todo) {
  				return;
  			}
  
  			if (value === '') {
  				todo.destroy();
  			} else {
  				todo.attr({
  					editing : false,
  					text : value
  				}).save();
  			}
  		}
docs: Update a todo