/**
  * Return whether the history item type is for a content item.
  * @param string $object_type
  * @return boolean
  * @access private
  */
 protected function _is_content_type($object_type)
 {
     return parent::_is_content_type($object_type) || $object_type == History_item_branch || $object_type == History_item_release;
 }
 /**
  * Apply default restrictions and tables.
  */
 public function apply_defaults()
 {
     parent::apply_defaults();
     $this->add_order('fldr.first_day DESC', true);
 }