How to avoid “Entities passed to the choice field must be managed. Maybe persist them in the entity manager?”

Question

1. Generated Entities from existing database
2. Generated CRUD controller

But it does not work with exception message:

Entit

Answer 1

This error means the attribute questionCategory which is a relationship, is not managed by the EntityManager. For this to be done automatically, add a cascade-persist in your Doctrine Mapping for questionCategory attribute:

Entity

/**
 * Question
 *
 * @ORM\Table(name="question")
 * @ORM\Entity
 */
class Question
{
    //...

    /**
     * @ORM\ManyToOne(
     *       targetEntity="QualityBundle\Entity\QuestionCategory", 
     *       cascade={"persist"}
     * )
     */
    private $questionCategory;

    //...
}

This way, when you call $em->persist($question);, the QuestionCategory linked to your Question will automatically be persisted as well.