app/models/tang/subscription.rb in tang-0.0.8 vs app/models/tang/subscription.rb in tang-0.0.9

@@ -27,10 +27,10 @@
       end
     end
 
     belongs_to :customer, class_name: Tang.customer_class.to_s
     belongs_to :plan
-    belongs_to :coupon
+    belongs_to :coupon, optional: true
     has_many :invoices, dependent: :destroy
 
     validates :customer, presence: true
     validates :plan, presence: true
     validates :stripe_id, presence: true, uniqueness: true