$validUser = $this->get('validator')->validate($user);
и ошибки пропали. Но и на других формах при сохранении проблем нет, а там принцип такой же. [Doctrine\ORM\ORMInvalidArgumentException]
A new entity was found through the relationship 'OwrBundle\Entity\Rating#user' that was not configured to cascade persist operations for entity: 1. To solve this iss
ue: Either explicitly call EntityManager#persist() on this unknown entity or configure cascade persist this association in the mapping for example @ManyToOne(..,cas
cade={"persist"}).