Add custom button to edit page of sonata admin bundle

Question

As you know, sonata admin bundle comes with three buttons in edit page which are \"Add new, update and delete\". I can remove delete button with this:

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Answer 1

You should hint the parameter if the file is in other namespace, and the add() method should work, but then you have to overwrite the Sonata's CRUD template to be able to display an other button/link.
Additionally you can define the controller and action which will be called.

For example:
src/Acme/DemoBundle/Admin/EntityAdmin.php:

protected function configureRoutes(\Sonata\AdminBundle\Route\RouteCollection $collection)
{
    $collection
        ->add('dummy',
            'dummy/{id}',
            array('_controller' => 'AcmeDemoBundle:Default:dummy'),
            array('id' => '\d+')
        )
    ;
}

src/Acme/HelloBundle/Controller/DefaultController.php:

/**
    @Route("/dummy/{id}", name="dummy",
        requirements={"id" = "\d+"}
    )
    @Template("AcmeDemoBundle:Default:dummy.html.twig")
*/
public function dummyAction($id)
{
    return(array(
        'id' => $id
    ));
}

app/Resources/SonataAdminBundle/views/CRUD/base_edit_form.html.twig:

{% block form %}
    ...
    {% else %}
        ...
        {% block formactions %}
            ...
            {% else %}
                ...
                {% if admin.id(object) %}
                    ...
                    {% if admin.hasroute('dummy') %}
                        <a class="btn" target="_blank" href="{{ admin.generateObjectUrl('dummy', object) }}">{% trans from 'SonataAdminBundle' %}link_dummy{% endtrans %}</a>
                    {% endif %}
                    ...