Doctrine 2 OneToMany Cascade SET NULL

Question

The error

Cannot delete or update a parent row: a foreign key constraint fails.

The classes

class Teacher {

    /**
     *@ORM\\OneToMan         


        

Answer 1

You should add the option onDelete="SET NULL" in the annotation of your entity Publication like this:

class Publication
{
    /**
    * @ORM\ManyToOne(targetEntity="Teacher", inversedBy="publications")
    * @ORM\JoinColumn(name="teacher_id", referencedColumnName="id", onDelete="SET NULL")
    */
    protected $teacher;
}

Cheers!