I have a legacy db table which has composite primary key. I don't think I will be able to change the structure to include a surrogate key, as there is some code written that uses that table. And in django, I cannot use that table, as it doesn't have a primary key(non-composite).
Do django models support composite primary keys? If not, is there any workaround without changing the structure of the table?
P.S. I am using postgresql.
Try similar below code:
class MyTable(models.Model): class Meta: unique_together = (('key1', 'key2'),) key1 = models.IntegerField(primary_key=True) key2 = models.IntegerField()
or if you want only unique mixed fields:
class MyTable(models.Model): class Meta: unique_together = (('key1', 'key2'),) key1 = models.IntegerField() key2 = models.IntegerField()
EDIT: I would like to note that there is a problem with this approach if there are 3 columns. Update queries don't work because it tries to update (puts pk fields right after "SET") the fields that are unique together and obviously fails.