Move extra bills to credit cards

app/models/credit_card_bill.rb

@@ -0,0 +1,5 @@
+class CreditCardBill < ApplicationRecord
+  def unpaid
+    amount - Expense.credit_card_monthly_total
+  end
+end

app/models/expense.rb

@@ -19,7 +19,7 @@ class Expense < ApplicationRecord
     Expense.all.map(&:monthly).sum.round(2)
   end
 
-  def self.autopaid_total
-    Expense.where(autopaid: true).map(&:monthly).sum.round(2)
+  def self.credit_card_monthly_total
+    Expense.where(credit_card: true).map(&:monthly).sum.round(2)
   end
 end

app/models/extra_bill.rb

@@ -1,5 +0,0 @@
-class ExtraBill < ApplicationRecord
-  def adjusted_amount
-    deduct_autopaid? ? amount - Expense.autopaid_total : amount
-  end
-end