public function delete($id)
{
try {
CategoryModel::find($id)->delete();
$alert['msg'] = 'Category has been deleted successfully';
$alert['type'] = 'success';
} catch (\Exception $ex) {
$alert['msg'] = 'This Category has been already used';
$alert['type'] = 'danger';
}
return Redirect::route('admin.category')->with('alert', $alert);
}