resultitemcontroller

   def validate params
    [:manufacturer, :model, :country_code].each do |field|
       incoming_param = params[field].blank? ? '' : params[field]
       field_value = self.send(field).blank? ? '' : self.send(field)
       if field_value !=  incoming_param
         error = Api::Errors::BadRequest.new('Bad Request it should be like manufacturer-country_code-model')
         raise error   
       end
     end
   end