boolean updated

app/models/sale_item.rb

@@ -55,7 +55,7 @@ class SaleItem < ApplicationRecord
       discount_account = {:name => a.title, :price => 0}
 
       # Check for actual sale items
-      sale_items.where("is_taxable = 0 AND remark = 'Discount'").find_each do |si|
+      sale_items.where("is_taxable = false AND remark = 'Discount'").find_each do |si|
         if si.account_id == a.id
           discount_account[:price] = (discount_account[:price] + si.price) * -1          
         end