How exactly to use onDelete = “SET NULL” - Doctrine2

Question

I have a class Category containing this:

/**
 * @ORM\\OneToMany(targetEntity=\"Friend\", mappedBy=\"category\")
 * @ORM\\OrderBy({\"name\" =         


        

Answer 1

This must be a crazy answer but did you update database schema? onDelete="SET NULL" is on database level, it must work on innoDB.