blob: a196c85092b25c2448233d73b151e064f3866680 (
plain)
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
|
"""
5. Many-to-many relationships
To define a many-to-many relationship, use ``ManyToManyField()``.
In this example, an ``Article`` can be published in multiple ``Publication``
objects, and a ``Publication`` has multiple ``Article`` objects.
"""
from django.db import models
from django.utils.encoding import python_2_unicode_compatible
@python_2_unicode_compatible
class Publication(models.Model):
title = models.CharField(max_length=30)
def __str__(self):
return self.title
class Meta:
ordering = ('title',)
@python_2_unicode_compatible
class Article(models.Model):
headline = models.CharField(max_length=100)
publications = models.ManyToManyField(Publication)
def __str__(self):
return self.headline
class Meta:
ordering = ('headline',)
|
