On the edit and delete page, the BravesheepCrudifyBundle needs to retrieve the object that we want to access. To do this the
BravesheepCrudifyBundle specifies the id property in the url. This property is then passed to a class tasked with loading
an entity from the database.
The default loader, used if no custom loader is specified, is the Bravesheep\CrudifyBundle\Query\RepositoryObjectRetriever.
If you take a look at the implementation of this class you can see that is simply retrieves the repository for the
entity and calls the find() method with the provided id.
However in some cases this may not be what you are looking for. In those cases you will want to create a custom
object retriever. You can do this by creating a class implementing Bravesheep\CrudifyBundle\Query\ObjectRetrieverInterface.
This interface has one method, retrieve(DefinitionInterface $definition, $id). Say for example that you are
using the Gedmo\Translatable behavior on your entity and you want to load the entity in a specific language. The
Translatable does this by letting you set the locale property of your entity and then calling refresh on the
entity manager. Alternatively you can even create a custom query that directly loads the entity as required.
Changing the retrieval of objects on the indexAction of the CrudifyController can be done by creating a
query modifier.
In order to activate your object retriever, you will need to set the mapping.object_retriever key of your mapping
to a service that contains your object retriever. In this case you can use Dependency Injection on your service to
include additional services. Alternatively you can specifiy the name of the object retriever class if you do not
need to specify any dependency injection. However this also means that the object must be constructable without
having any required parameters in the constructor. Also take a look at the default config.