update

app/models/sale.rb

@@ -57,11 +57,11 @@ class Sale < ApplicationRecord
       self.tax_type = "exclusive"
 
       # set cashier by current login
-      self.cashier_id = requested_by.id
-      self.cashier_name = requested_by.name
+      # TODO: requested_by is string , can't cast to id. error occur. please fix
+      # self.cashier_id = requested_by.id
+      self.cashier_name = requested_by
+      self.requested_by = requested_by
 
-
-      self.requested_by = requested_by.name
       self.requested_at = DateTime.now.utc
 
       Rails.logger.debug "Order -> #{order.id} | order_status -> #{order.status}"