protected function get_place_holders( $args ) {
		$wheres = [];
		foreach ( $args as $key => $val ) {
			if ( ! isset( $this->default_placeholder[ $key ] ) ) {
				throw new \Exception( sprintf( __( 'Model %1$s has no column "%2$s".', 'karma' ), get_called_class(), $key ), 500 );
			}
			$wheres[] = $this->default_placeholder[ $key ];
		}
		return $wheres;
	}