gistfile1.builder

#this method gets called on the before_save of transaction_item.
  def apply_adjustments
    applicable_adjustments = self.class.adjustments_to_apply[self.status.name.methodize.to_sym] || []
    unless applicable_adjustments.empty?
      pairing = if [:shipping_ready, :pending].include?(self.status.name.methodize.to_sym) && self.estimated_value
                  [:estimated_value, :estimated_total=]
                elsif [:awaiting_confirmation, :accepted].include?(self.status.name.methodize.to_sym) &&
                      self.inspected_value
                  [:inspected_value, :payout_total=]
                end
      total_adjustment_value = 0
      applicable_adjustments.each do |a|
        total_adjustment_value += (a.apply_to(self) || 0)
      end

      unless pairing.nil?
        total = ('%.2f' % (self.send(pairing[0]) + total_adjustment_value)).to_f
        self.send(pairing[1], total)
      end
    end
  end