fixed conflict

app/models/sale.rb

@@ -1,6 +1,9 @@
-#primary key - need to be unique generated for multiple shops
-
 class Sale < ApplicationRecord
+  self.primary_key = "sale_id"
+  
+  #primary key - need to be unique generated for multiple shops
+  before_create :generate_custom_id
+
   #before_create :generate_receipt_no
   belongs_to :cashier, :optional => true
   belongs_to :customer, :optional => true
@@ -243,4 +246,8 @@ class Sale < ApplicationRecord
     end
   end
 
+  private
+  def generate_custom_id
+    self.sale_id = SeedGenerator.generate_id(self.class.name, "SAL")
+  end
 end