ActiveRecord\Table::set_primary_key PHP Method

    private function set_primary_key()
    {
        if (($pk = $this->class->getStaticPropertyValue('pk', null)) || ($pk = $this->class->getStaticPropertyValue('primary_key', null))) {
            $this->pk = is_array($pk) ? $pk : array($pk);
        } else {
            $this->pk = array();
            foreach ($this->columns as $c) {
                if ($c->pk) {
                    $this->pk[] = $c->inflected_name;
                }
            }
        }
    }