HMT collection_singular_ids= deletion of join models is direct, no destroy callbacks are triggered

Question

Just ran into an issue with a has_many :through association and after/before-destroy callbacks not being triggered.

Say, I have users, groups, and an intermediate relati

Answer 1

I've struggled with the same problem recently and solved it by extending association and overriding its delete method:

class User < ActiveRecord::Base
  has_many :memberships
  has_many :groups, :through => :memberships do
    def delete(*args)
      groups = args.flatten
      # destroy memberships in order to trigger their callbacks:
      proxy_association.owner.memberships.where(group_id: groups).destroy_all
      super
    end
  end
  ...
end