after.rb

item = []
flag = false
MaintenanceServiceRequest.where(car_id: self.maintenance_service_request.car_id).order(created_at: "desc").drop(1).each do |msr|
  msr.maintenance_service_request_items.each do |i|
    if i.maintenance_service_id == self.maintenance_service_id
      item = i
      flag = true
      break
    end
  end
  if flag
    break
  end
end