/tests/modeltests/m2m_multiple/models.py

 1"""
 220. Multiple many-to-many relationships between the same two tables
 3
 4In this example, an ``Article`` can have many "primary" ``Category`` objects
 5and many "secondary" ``Category`` objects.
 6
 7Set ``related_name`` to designate what the reverse relationship is called.
 8"""
 9
10from django.db import models
11
12class Category(models.Model):
13    name = models.CharField(max_length=20)
14    class Meta:
15       ordering = ('name',)
16
17    def __unicode__(self):
18        return self.name
19
20class Article(models.Model):
21    headline = models.CharField(max_length=50)
22    pub_date = models.DateTimeField()
23    primary_categories = models.ManyToManyField(Category, related_name='primary_article_set')
24    secondary_categories = models.ManyToManyField(Category, related_name='secondary_article_set')
25    class Meta:
26       ordering = ('pub_date',)
27
28    def __unicode__(self):
29        return self.headline
30