Make another entity from entity by Doctrine

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I have two tables, user and userAttr.

'user' and 'userAttr' are tied as onebyone.

I would like to insert a row in userAttr when row is inserted user.

So this is my idea.

Make new data row of userAttr In prePersist() method in user entity.

in Acme/UserBundle/Entity/User.php

class User extends BaseUser implements ParticipantInterface
{
    public function prePersist()
    {
        $userAttr = new userAttr();
        $userAttr->setUser($this);

        $userAttr->setEnabled(true);
        $this->setUserAttr($userAttr);

        $em = $this->getDoctrine()->getManager();
        $em->persist($userAttr);
        $em->flush();

but it shows error like this.

Fatal error: Call to undefined method Acme\UserBundle\Entity\User::getDoctrine() in

There are two quesions.

1.Is my basic idea correct?

2.How can I get the instance of doctrine in entity class?

asked 1 min ago

whitebear

851

Make another entity from entity by Doctrine