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add_association_callbacks(association_name, options) private

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# File activerecord/lib/active_record/associations.rb, line 1351
        def add_association_callbacks(association_name, options)
          callbacks = %w(before_add after_add before_remove after_remove)
          callbacks.each do |callback_name|
            full_callback_name = "#{callback_name}_for_#{association_name}"
            defined_callbacks = options[callback_name.to_sym]
            if options.has_key?(callback_name.to_sym)
              class_inheritable_reader full_callback_name.to_sym
              write_inheritable_attribute(full_callback_name.to_sym, [defined_callbacks].flatten)
            else
              write_inheritable_attribute(full_callback_name.to_sym, [])
            end
          end
        end
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