python - Django: Force a field to be unique for all model objects with the same foreign key -

Assume that I have the following models defined in the DEGENGO (not tested):

  class caramaker  
 (Models.Model): name = models.CharField ( "Car maker's name", max_length = 40) class car (models.Model): car_id = models.IntegerField ("ID for this particular car") Producer = Model. ForeignKey ("Manufacturer of this car")   
 Is there a standard way to ensure that all  cars  s is with the same  manufacturer   all   car  s  
 For example create unique  car_id , without  car_id  two car makers, "Skoda" and "Renault" are created by Skoda 400  cars  300  car  created by s and Renault, I want to make sure that car_id is unique to all Škoda, and is unique to all the rnnist but all  cars  s  
 Thank you   
 
 
 Model option  Unique_togethe R . See Django Docs:  
  Class car (models.Model): car_id = model.tegerfield ("ID for this particular car") manufacturer = model. Forvinki ("Manufacturer of this car") Category Meta (object): unique_toggler = ("car_id", "creator")