A new entity was found through the relationship - forms

Question

The error message:
A new entity was found through the relationship
'AppBundle\Entity\Tarifa#pesos' that was not configured to cascade
persist operations for entity:
AppBundle\Entity\TarifaPeso#0000000072d3bd4300000000232470d3. To solve
this issue: Either explicitly call EntityManager#persist() on this
unknown entity or configure cascade persist this association in the
mapping for example #ManyToOne(..,cascade={"persist"}). If you cannot
find out which entity causes the problem implement
'AppBundle\Entity\TarifaPeso#__toString()' to get a clue.
Tarifa.php
/**
* #ORM\OneToMany(targetEntity="TarifaPeso", mappedBy="tarifa")
*/
private $pesos;
TarifaPeso.php
/**
* #ORM\ManyToOne(targetEntity="Tarifa", inversedBy="pesos", cascade={"persist"})
* #ORM\JoinColumn(name="tarifa_id", referencedColumnName="id")
*/
private $tarifa;
TarifaType.php
->add('pesos', CollectionType::class, array(
'entry_type' => TarifaPesoType::class,
'allow_add' => true,
'allow_delete' => true,
'by_reference' => false
))
The controller...
public function newAction(Request $request)
{
$tarifa = new Tarifa();
$form = $this->createForm('AppBundle\Form\TarifaType', $tarifa);
$form->handleRequest($request);
if ($form->isSubmitted() && $form->isValid()) {
$entityManager = $this->getDoctrine()->getManager();
$entityManager->persist($tarifa);
$entityManager->flush();
$this->addFlash('success', 'project.created_successfully');
return $this->redirectToRoute('admin_post_index');
}
return $this->render('admin/tarifas/new.html.twig', array(
'form' => $form->createView(),
));
}
What am I missing? Really exhausted... please any help?

Answer 1

You should move cascade={"persist"} annotation from TarifaPeso::tarifa to Tarifa::pesos property. Or you can explicitly persist all pesos you get from the form:
$entityManager->persist($tarifa);
foreach ($tarifa->getPesos() as $peso) {
$entityManager->persist($peso);
}
$entityManager->flush();

Answer 2

Ok, it is solved, now it stores the Tarifa id in the TarifaPeso table. The error was I'd removed the line from the AddPeso method:
public function addPeso(\AppBundle\Entity\TarifaPeso $pesos)
{
$this->pesos[] = $pesos;
$pesos->setTarifa($this);
return $this;
}