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
39
40
41
|
from django.db import models
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 = models.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 = models.ForeignObject(
Customer,
models.CASCADE,
related_name="contacts",
to_fields=["customer_id", "company"],
from_fields=["customer_code", "company_code"],
)
|
