Symfony REST DTO validation and inject in Model like paramconverter - json

Question

I want to create a request filter for post actions in a json rest api that takes the request's body and fill the DTO, validate it and inject it in the controller action like paramconverter.
How can I do that?
I have a DTO like this:
class ExampleDTO
{
/**
* #var string
*
* #NotNull(message="El campo nombre es requerido")
* #Type(name="string", message="El campo nombre tiene un tipo incorrecto")
*/
private $nombre;
/**
* #return string
*/
public function getNombre()
{
return $this->nombre;
}
/**
* #param string $nombre
*/
public function setNombre($nombre)
{
$this->nombre = $nombre;
}
}
Now I want to transform the json to this DTO and inject it into controller.

Answer 1

Actually ParamConverter works with route params (like as {id} in "/myapp.com/post/{id}"), not with request body.
If you use FOSRestBundle, Request Body Converter Listener (http://symfony.com/doc/current/bundles/FOSRestBundle/request_body_converter_listener.html) is available.
Simple example from FOSRestBundle docs:
/**
* #ParamConverter("dto", converter="fos_rest.request_body", options={"validator"={"groups"={"foo", "bar"}}})
*/
public function putAction(ExampleDTO $exampleDTO, ConstraintViolationListInterface $validationErrors)
{
if (count($validationErrors) > 0) {
// Handle validation errors
}
// ...
}
Also you should adjust your app confiuration for this approach this way:
# app/config/config.yml
sensio_framework_extra:
request: { converters: true }
# app/config/config.yml
fos_rest:
body_converter:
enabled: true