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Viewing changes to tests/modeltests/m2m_multiple/models.py

  • Committer: Bazaar Package Importer
  • Author(s): Scott James Remnant
  • Date: 2008-11-15 19:15:33 UTC
  • mto: This revision was merged to the branch mainline in revision 17.
  • Revision ID: james.westby@ubuntu.com-20081115191533-84v2zyjbmp1074ni
Tags: upstream-1.0.1
Import upstream version 1.0.1

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tests/modeltests/m2m_multiple/models.py
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"""
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20. Multiple many-to-many relationships between the same two tables
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In this example, an ``Article`` can have many "primary" ``Category`` objects
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and many "secondary" ``Category`` objects.
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Set ``related_name`` to designate what the reverse relationship is called.
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"""
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from django.db import models
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class Category(models.Model):
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    name = models.CharField(max_length=20)
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    class Meta:
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       ordering = ('name',)
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    def __unicode__(self):
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        return self.name
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class Article(models.Model):
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    headline = models.CharField(max_length=50)
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    pub_date = models.DateTimeField()
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    primary_categories = models.ManyToManyField(Category, related_name='primary_article_set')
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    secondary_categories = models.ManyToManyField(Category, related_name='secondary_article_set')
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    class Meta:
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       ordering = ('pub_date',)
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    def __unicode__(self):
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        return self.headline
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__test__ = {'API_TESTS':"""
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>>> from datetime import datetime
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>>> c1 = Category(name='Sports')
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>>> c1.save()
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>>> c2 = Category(name='News')
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>>> c2.save()
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>>> c3 = Category(name='Crime')
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>>> c3.save()
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>>> c4 = Category(name='Life')
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>>> c4.save()
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>>> a1 = Article(headline='Area man steals', pub_date=datetime(2005, 11, 27))
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>>> a1.save()
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>>> a1.primary_categories.add(c2, c3)
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>>> a1.secondary_categories.add(c4)
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>>> a2 = Article(headline='Area man runs', pub_date=datetime(2005, 11, 28))
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>>> a2.save()
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>>> a2.primary_categories.add(c1, c2)
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>>> a2.secondary_categories.add(c4)
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>>> a1.primary_categories.all()
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[<Category: Crime>, <Category: News>]
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>>> a2.primary_categories.all()
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[<Category: News>, <Category: Sports>]
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>>> a1.secondary_categories.all()
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[<Category: Life>]
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>>> c1.primary_article_set.all()
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[<Article: Area man runs>]
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>>> c1.secondary_article_set.all()
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[]
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>>> c2.primary_article_set.all()
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[<Article: Area man steals>, <Article: Area man runs>]
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>>> c2.secondary_article_set.all()
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[]
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>>> c3.primary_article_set.all()
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[<Article: Area man steals>]
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>>> c3.secondary_article_set.all()
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[]
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>>> c4.primary_article_set.all()
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[]
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>>> c4.secondary_article_set.all()
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[<Article: Area man steals>, <Article: Area man runs>]
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"""}