app/models/billing/charge.rb in billing-0.0.3 vs app/models/billing/charge.rb in billing-0.0.4a

@@ -1,12 +1,27 @@
 module Billing
   class Charge < ActiveRecord::Base
     include AccountItem
     belongs_to :account, inverse_of: :charges, validate: true
     belongs_to :chargable, polymorphic: true
+    belongs_to :origin, inverse_of: :charges
+    has_one :modifier, inverse_of: :charge
+
     monetize :price_cents
+    monetize :value_cents
     
+    delegate :paid?, to: :account
+    
+    scope :unpaid, -> { joins(:account).where.not(billing_accounts: { balance_cents: 0}) }
+    scope :paid, -> { joins(:account).where(billing_accounts: { balance_cents: 0}) }
+    scope :in_period, lambda {|from, to| where(revenue_at: from..to) }
+    
     validates_presence_of :price
+    validates_numericality_of :value, greater_than_or_equal_to: 0
+    
+    before_save do
+      self.value = price unless modifier.present? #FIXME global account modifier lost
+    end
     
     class << self
       def args(*args)
         case when args.blank? || args.first.is_a?(Hash) then
           {}.merge(*args)