Cake\Database\Query::epilog PHP Method

    public function epilog($expression = null)
    {
        $this->_dirty();
        $this->_parts['epilog'] = $expression;
        return $this;
    }

 /**
  * Modifies the original insert query to append a "RETURNING *" epilogue
  * so that the latest insert id can be retrieved
  *
  * @param \Cake\Database\Query $query The query to translate.
  * @return \Cake\Database\Query
  */
 protected function _insertQueryTranslator($query)
 {
     if (!$query->clause('epilog')) {
         $query->epilog('RETURNING *');
     }
     return $query;
 }