Rails :dependent => :destroy VS :dependent => :delete_all

by

The difference is with the callback.

The :delete_all is made directly in your application and deletes by SQL :

DELETE * FROM users where compagny_id = XXXX

With the :destroy, there is an instantiation of all of your children. So, if you can’t destroy it or if each has their own :dependent, its callbacks can be called.

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