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In rails guides it’s described like this:
Objects will be in addition destroyed if they’re associated with
:dependent => :destroy, and deleted if they’re associated with:dependent => :delete_all
Right, cool. But what’s the difference between being destroyed and being deleted?
I tried both and it seems to do the same thing.
The difference is with the callback.
The
:delete_allis made directly in your application and deletes by SQL :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.