Deal with a nullable relation field in an Entity with Doctrine2

Entity generation from an existing database is a long way to go... Last issue : set a relation field to NULL => the generated setter expects an Entity Object as a parameter

MyEntity is an entity including a field myRelatedEntity referencing an entity MyRelatedEntity. Basic generation produces this setter :

class MyEntity
{

    ...

    /**
     * Set myRelatedEntity
     *
     * @param Xxx\YourBundle\Entity\MyRelatedEntity $myRelatedEntity
     */
    public function setMyRelatedEntity(MyRelatedEntity $myRelatedEntity)
    {
        $this->myRelatedEntity = $myRelatedEntity;
    }

    ...

}

This setter doesn't allow to set NULL value. Instead you get this kinf of error :

Catchable fatal error: Argument 1 passed to setMyRelatedEntity() must be an instance of \Xxx\YourBundle\Entity\MyRelatedEntity, null given

This indicates you have to modify the setter to accept null value :

class MyEntity
{

    ...

    /**
     * Set myRelatedEntity
     *
     * @param mixed $myRelatedEntity Entity MyRelatedEntity or NULL
     */
    public function setMyRelatedEntity(MyRelatedEntity $myRelatedEntity = null)
    {
        $this->myRelatedEntity = $myRelatedEntity;
    }

    ...

}