How to make has many through polymorphic associations dependent in rails 3?

I have a polymorphic relationshi开发者_运维百科p in rails 3 and i am trying to make the through table dependent. What is the best way to handle that?

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Would help to have some example code that you are trying this with. But the following is an example of how to get this to work.

class Listing < ActiveRecord::Base
  has_many :activity_items, :as => :source, :dependent => :destroy
end

class ActivityItem < ActiveRecord::Base
  belongs_to :source, :polymorphic => :true
end

That should work as expected.