I get the following error in Rails 4
dependent option must be one of destroy delete
apparently https://github.com/rails/rails/issues/3458 other options were supported before. But what is possible nowadays? I could not find any other documentation
thank you for your help
Docs are available here
Looks like the following options are supported:
nil - do nothing (default).
:destroy - causes all the associated objects to also be destroyed.
:delete_all - causes all the associated objects to be deleted directly from the database (so callbacks will not be executed).
:nullify - causes the foreign keys to be set to NULL. Callbacks are not executed.
:restrict_with_exception - causes an exception to be raised if there are any associated records.
:restrict_with_error - causes an error to be added to the owner if there are any associated objects.
Adding to Ben's Answer, if it is required to do nothing on deletion, nil (which is default behaviour) can also be used