Ruby on Rails

Hi,

I'm learning rails and have run into what for me is a difficult problem.
I have the following associations with a galleries_pictures and a
pictures_questions join table:

class Picture < ActiveRecord::Base
has_and_belongs_to_many :questions
has_and_belongs_to_many :galleries

class Question < ActiveRecord::Base
has_and_belongs_to_many :pictures

class Gallery < ActiveRecord::Base
has_and_belongs_to_many :pictures

In the edit question view, a question and its associated picture(s) can
be edited. My problem is, I cannot figure out how to delete the picture
in the question and at the same time not delete it from the gallery ie
delete the pictures_questions association but not the
galleries_pictures association.

The action called from the view deletes the row in both join tables:
def destroy
@picture = Picture.find(params[:id])
@picture.destroy

Thanks!

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