Apparently dependent => destroy is ignored when also using the :through option.
So I have this...
class Comment < ActiveRecord::Base
has_many :comment_users, :dependent => :destroy
has_many :users, :through => :comment_users
...
end
...but deleting a Comment does not result in the associated comment_user records getting deleted.
What's the recommended approach, then, for cascade deletes when using :through?
Apparently :dependent is not ignored!
The real issue was that I was calling Comment.delete(id)
which goes straight to the db, whereas I now use Comment.destroy(id)
which loads the Comment object and calls destroy() on it. This picks up the :dependent => :destroy
and all is well.