public function setColumns(array $columns)
    {
        // add columns
        foreach($columns['add'] as $key => $value) {
            $this->dataTables->addColumn($key, $value);
        }

        // edit columns
        foreach($columns['edit'] as $key => $value) {
            $this->dataTables->editColumn($key, $value);
        }

        // remove columns
        foreach($columns['remove'] as $value) {
            $this->dataTables->removeColumn($value);
        }
    }