Rails dependent which options are possible?

问题

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

回答1:

Docs are available here

Looks like the following options are supported:

• :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.

来源：https://stackoverflow.com/questions/25962326/rails-dependent-which-options-are-possible