/**
* Add a foreign key to a database table.
*
* In $options you can specify: on_delete = cascade, no_action ..,
* on_update, constraint = constraint name.
*
* @param string $columns
* @param string $referencedTable
* @param array $referencedColumns
* @param array $options
*
* @return $this
*/
public function addForeignKey($columns, $referencedTable, $referencedColumns = ['id'], $options = [])
{
$this->table->addForeignKey($columns, $referencedTable, $referencedColumns, $options);
return $this;
}
