1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
from django.db import models
from django.db.models.fields.related import ForeignObject
class Address(models.Model):
company = models.CharField(max_length=1)
customer_id = models.IntegerField()
class Meta:
unique_together = [
('company', 'customer_id'),
]
class Customer(models.Model):
company = models.CharField(max_length=1)
customer_id = models.IntegerField()
address = ForeignObject(
Address, models.CASCADE, null=True,
# order mismatches the Contact ForeignObject.
from_fields=['company', 'customer_id'],
to_fields=['company', 'customer_id'],
)
class Meta:
unique_together = [
('company', 'customer_id'),
]
class Contact(models.Model):
company_code = models.CharField(max_length=1)
customer_code = models.IntegerField()
customer = ForeignObject(
Customer, models.CASCADE, related_name='contacts',
to_fields=['customer_id', 'company'],
from_fields=['customer_code', 'company_code'],
)
|
