IntegrityError: null value in column “city_id ” violates not-null constraint

Question

I two model:

class City(models.Model):
    name = models.CharField(max_length=50)
    country = models.OneToOneField(Country)

    def __unicode__(self):
            


        

Answer 1

city = models.OneToOneField(City)

Are you sure you want only one user per city? I think you need

city = models.ForeignKey(City, null=True, blank=True)

null, blank because the sycndb will create a profile and will fail if no city is passed.

Alternatively, you can pass default=default_city_id to the city ForeignKey