ORM::set_expr PHP Method

    public function set_expr($key, $value = null)
    {
        return $this->_set_orm_property($key, $value, true);
    }

 /**
  * Setter method, allows $model->set_expr('property', 'value') access to data.
  *
  * @param  string|array $property
  * @param  string|null  $value
  * @return void
  */
 public function set_expr($property, $value = null)
 {
     $this->orm->set_expr($property, $value);
     return $this;
 }