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php – How exactly to use onDelete = "SET NULL" – Doctrine2

Posted by: admin April 23, 2020 Leave a comment


I have a class Category containing this:

 * @ORM\OneToMany(targetEntity="Friend", mappedBy="category")
 * @ORM\OrderBy({"name" = "ASC"})
protected $friends;

and a class Friend with this:

 * @ORM\ManyToOne(targetEntity="Category", inversedBy="friends")
 * @ORM\JoinColumn(name="category_id", referencedColumnName="id",  onDelete="SET NULL")
protected $category;

What I want is to be able to delete categories no matter if there are some friends from this category, and if there are – the category field for this friends to be set to NULL.

I tried to put onDelete="CASCADE" to the ManyToOne annotation, then to the OneToMany, I tried what is shown above, I tried using cascade={"remove"} in the OneToMany annotation, and nothing worked! I couldn’t find a example as well. Could you please help me?

How to&Answers:

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