update request bill for another role in request_bill_con and sale.rb

app/models/sale.rb

@@ -78,12 +78,24 @@ class Sale < ApplicationRecord
       self.tax_type = "exclusive"
 
       # set cashier
-      if cashier != nil
+      open_cashier = Employee.where("role = 'cashier' AND token_session <> ''")
+      shift = ShiftSale.current_open_shift(cashier.id)
+
+      # set cashier
+      if shift != nil
         self.cashier_id = cashier.id
         self.cashier_name = cashier.name
+        self.shift_sale_id = shift.id
       else
-        self.cashier_id = requested_by.id
-        self.cashier_name = requested_by.name
+        if open_cashier.nil?
+          self.cashier_id   = requested_by.id
+          self.cashier_name = requested_by.name
+          self.shift_sale_id = open_cashier[0].id
+        else
+          self.cashier_id   = open_cashier[0].id
+          self.cashier_name = open_cashier[0].name
+          self.shift_sale_id = open_cashier[0].id
+        end
       end
 
       # set waiter