Insert data from form to database - symfony

Question

What i want to do is next:
Create simple form with FormBuilder
When form is submitted the result to be saved into database for particular user ( based on its ID )
In addition is the code from the controller:
public function helloAction(Request $request, $id){//displaying individual results for particular user//
// find the username which was in the view//
$em = $this->getDoctrine()->getManager();
$query = $em->createQuery('SELECT b FROM AcmeWebBundle:baza b WHERE b.id = :id' )
->setParameter('id',$id);
$total = $query->getResult();
$baza = new baza ();
$em = $this->getDoctrine()->getManager();
$em->persist($baza);
$form = $this->createFormBuilder($baza)
->add ('rating','choice',array('label'=>'TEST44','choices'=>array(
'1'=>'1',
'2'=>'2',
'3'=>'3',
'4'=>'4'
),
'expanded'=>true,
'multiple'=>false
))
->getForm();
if ($request->getMethod() == 'POST') {
$form->bindRequest($request);
if ($form->isValid()) {
// perform some action, such as saving the task to the database
$em->flush();
return new Response('<h1>THANKS FOR Your feedback !!!!</h1>');
}
}
return $this->render('AcmeWebBundle:Default:hello.html.twig',array('all'=>$total,'id'=>$id ,'form'=>$form->createView()));
}
}
But this creates new row in the database, and add value only for the rating column.Moreover, id field,username and etc.. are empty.
What i want to do is, rating to be added for the colum rating, but for specific ID.

Answer 1

In the following example I create a form, get the data on POST and then persist the fresh object or a modified one, there is no point in persisting an empty object.
public function historialAction(Request $request)
{
$form = $this->createFormBuilder()
->add('phone', 'text', array('attr' => array('autofocus' => '')))
->add('period', 'number', array('attr' => array('value' => '12')))
->getForm();
if ($request->isMethod('POST')) {
$form->bind($request);
// data is an array with "phone" and "period" keys
$data = $form->getData();
$em = $this->getDoctrine()->getManager();
$contract = $em->getRepository('FrontBundle:Contract')->getContractByPhone($data["phone"]);
$contract->setOwner("John Doe");
$contract->setPhone($data["phone"]);
// or this could be $contract = new Contract("John Doe", $data["phone"], $data["period"]);
$em->persist($contract); // I set/modify the properties then persist
}

Answer 2

You could set the rating to the user entity like so..
if ($form->isValid())
$rating = $form->get('rating')->getData();
$user->setRating($rating);
// Assuming $user is the user entity
// etc..