am new with symfony and i need some advices - symfony

Question

I have a problem regarding a Symfony application, I want to take as input the "username" or "id" for my controller , and receive information that is in my table "user" and also 2 other table for example : A user has one or more levels , and also it has points must earn points to unlock a level , I want my dan Home page display the username and the level and extent that it has , I jn am beginner and not come to understand the books symfony that I use, I work with PARALLEL " symfony_book " and " symfony_cook_book " and also tutorial youtube May I blocks , here is the code for my cotroler
"
/**
* #Route("/{id}")
* #Template()
* #param $id=0
* #return array
*/
public function getUserAction($id)
{
$username = $this->getDoctrine()
->getRepository('voltaireGeneralBundle:FosUser')
->find($id);
if (!$username) {
throw $this->createNotFoundException('No user found for id '.$id);
}
//return ['id' => $id,'username' => $username];
return array('username' => $username);
}
and I have to use the relationship among classes
use Doctrine\Common\Collections\ArrayCollection;
class Experience {
/**
* #ORM\OneToMany(targetEntity="FosUser", mappedBy="experience")
*/
protected $fosUsers;
public function __construct()
{
$this->fosUsers = new ArrayCollection();
}
}
and
class FosUser {
/**
* #ORM\ManyToOne(targetEntity="Experience", inversedBy="fosUsers")
* #ORM\JoinColumn(name="experience_id", referencedColumnName="id")
*/
protected $fosUsers;
}
and i have always an error

Answer 1

In Symfony you cannot return an array in Action function!, Action function must always return a Response object...So if you want to return data to browser in Symfony, Action function have to return a string wrapped up in Response object.
In your controller code, to return the array to browser, You can serialize an array to JSON and send it back to browser:
public function getUserAction($id)
{
$username = $this->getDoctrine()
->getRepository('voltaireGeneralBundle:FosUser')
->find($id);
if (!$username) {
throw $this->createNotFoundException('No user found for id '.$id);
}
return new Response(json_encode(array('username' => $username)));
}
I suggest you to read more about HTTP protocol , PHP, and Symfony.