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def delete_coupon
    set_default_objects
    coupon = @coupons.find(params[:coupon_id])
    coupon.destroy
    @coupons.delete(coupon)
    render(:update) do |page|
      page.replace_html "coupon_list",
            :partial => "coupon_list",
            :locals => {:total_savings => @total_savings,
            :coupon_list => @coupons,
            :coupon_tags => @coupon_tags}
    end
  end