To update close cashier

app/models/shift_sale.rb

@@ -149,6 +149,13 @@ class ShiftSale < ApplicationRecord
           .first()
   end 
 
+  def self.get_total_other_charges(shift) 
+      query = SaleItem.select("sum(sale_items.qty * sale_items.unit_price) as total_other_charges_amount")
+          .joins("JOIN sales as s ON s.sale_id = sale_items.sale_id")
+          .where('shift_sale_id =? and s.sale_status = "completed" and sale_items.product_code = "Other Charges" and sale_items.item_instance_code is null',shift.id)
+          .first()
+  end 
+
   def self.search(filter,from,to)
     if filter.blank?
         keyword = ''