Ojs\AdminBundle\Controller\AdminMailTemplateController::indexAction PHP Method

    public function indexAction()
    {
        $source = new Entity('OjsJournalBundle:MailTemplate');
        $tableAlias = $source->getTableAlias();
        $source->manipulateQuery(function ($query) use($tableAlias) {
            $query->andWhere($tableAlias . '.journal IS NULL');
        });
        $grid = $this->get('grid')->setSource($source);
        $gridAction = $this->get('grid_action');
        $actionColumn = new ActionsColumn("actions", 'actions');
        $rowAction[] = $gridAction->showAction('ojs_admin_mail_template_show', 'id');
        $rowAction[] = $gridAction->editAction('ojs_admin_mail_template_edit', 'id');
        $actionColumn->setRowActions($rowAction);
        $grid->addColumn($actionColumn);
        $data = [];
        $data['grid'] = $grid;
        return $grid->getGridResponse('OjsAdminBundle:AdminMailTemplate:index.html.twig', $data);
    }