gistfile1.txt

b1 = BillingChecker.new(coupon: 0, vat: 1, margin: 1, first_date: DateTime.parse("2013-09-01"), end_time: DateTime.parse("2013-09-30"))
b2 = BillingChecker.new(coupon: 0, vat: 1, margin: 1, first_date: DateTime.parse("2013-10-01"), end_time: DateTime.parse("2013-10-31"))
b1.perform
b2.perform

result = b2.totals.map do |u|
  uo = User.find_by_email u[:email]
  us = b1.totals.detect{|t|t[:email] == u[:email]}
  rc = us[:net_total]  - User::DEFAULT_CREDIT
  rc = rc > 0 ? 0 : (rc * -1)
  oc = rc
  bill = u[:net_total] - rc
  {:id => uo.id, :bill => bill < 0 ? 0 : bill, :rc => bill < 0 ? (bill * -1) : 0, :oc => oc}
end