Routing
=======

The default routes used in the CRUD controller are accessible through the
``Admin`` class.

The ``Admin`` class contains two routing methods:

* ``getRoutes()``: Returns the available routes;
* ``generateUrl($name, $options)``: Generates the related routes.

Routing Definition
------------------

You can set a ``baseRouteName`` property inside your ``Admin`` class, which
represents the route prefix.  

.. code-block:: php

    class PostAdmin extends Admin
    {
        protected $baseRouteName = 'news_post_admin';
    }

If no ``baseRouteName`` is defined then the Admin will pick one for you, built
in the following format: 'admin_vendor_bundlename_entityname_action'. If the
Admin fails to find the best baseRouteName then a ``RuntimeException`` will
be thrown.

The same goes for the ``baseRoutePattern``.

Routing usage
-------------

Inside a CRUD template, a route can be generated by using the ``Admin`` class.

.. code-block:: html

    <a href="{{ admin.generateUrl('list') }}">List</a>

    <a href="{{ admin.generateUrl('list', params|merge('page': 1) }}">List</a>

Create a route
--------------

You can easily register new routes by defining them in the ``Admin`` class.
Only Admin routes should be registered this way. Of course this requires the
related action to be defined in the controller.

As route is always generated with the ``Admin`` context, it can only be
defined by its name.

.. code-block:: php

    use Sonata\AdminBundle\Route\RouteCollection;

    class MediaAdmin extends Admin
    {
        public function configureRoutes(RouteCollection $collection)
        {
            $collection->add('duplicate');
            $collection->add('view', $this->getRouterIdParameter().'/view');
        }
    }


Persistent parameters
---------------------

In some cases, the interface might required to pass the same parameters across the different ``Admin``'s actions.
Instead of settings them in the template or doing other weird hacks, you can defined a ``getPersistentParameters``
method. This method will be used when a link is being generated.

.. code-block:: php

    class MediaAdmin extends Admin
    {
        public function getPersistentParameters()
        {
            if (!$this->getRequest()) {
                return array();
            }

            return array(
                'provider' => $this->getRequest()->get('provider'),
                'context'  => $this->getRequest()->get('context', 'default'),
            );
        }
    }

    // the result :
    //   $admin->generateUrl('create') => /admin/module/create?context=default