django database mapping one-to-one.md

one to one

• one person one license

# models.py
class Person(models.Model):
  name = models.CharField(max_length=20)

class License(models.Model):
  license_number = models.IntegerField()
  person = models.OneToOneField(Person, on_delete=models.CASCADE)

>>> from cbvApp.models import Person, License
>>> p = Person(name='james')
>>> p.save()
>>> l = License(person=p, license_number='112233')
>>> l.save()
>>> p.license

Person
+----+-------+
| id | name  |
+----+-------+
|  1 | james |
+----+-------+

License
+----+----------------+-----------+
| id | license_number | person_id |
+----+----------------+-----------+
|  1 |         112233 |         1 |
+----+----------------+-----------+