Question

I have a three entity:

class User
{
    @ORM\OneToMany(targetEntity="Conversation", mappedBy="sender", cascade={"remove"})
    private $send_messages;
}

///

class Conversation
{
    /**
     * @ORM\ManyToOne(targetEntity="User", inversedBy="send_messages")
     * @ORM\JoinColumn(name="sender_id", referencedColumnName="id", onDelete="SET NULL")
     */
    private $sender;
}

///

class Message
{
    /**
     * @ORM\OneToMany(targetEntity="Conversation", mappedBy="message")
     */
    private $conversations;

    /**
     * @ORM\PreRemove
     */
    function onPreRemove()
    {
         // how remove parent relationship ????
    }
}

When I delete the User, Conversation deleted by CASCADE. Question – how to remove and Message when deleted Coversation is last relation of Message.

Answer 1

I think what you’re looking for is Doctrine2 “Orphan removal“

If an Entity of type A contains references to privately owned Entities B then if the reference from A to B is removed the entity B should also be removed, because it is not used anymore.