1👍
✅
Try unique_together
.
class MasterService(models.Model):
master = models.ForeignKey(Master)
service = models.ForeignKey(Service)
price = models.PositiveIntegerField(blank=True)
class Meta:
unique_together = ('master', 'service')
This constraint will be enforced at the database level, so it won’t be possible to associate a service
with a master
more than once. See the docs.
Source:stackexchange.com