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

  • Committer: Bazaar Package Importer
  • Author(s): Scott James Remnant, Eddy Mulyono
  • Date: 2008-09-16 12:18:47 UTC
  • mfrom: (1.1.5 upstream) (4.1.1 lenny)
  • Revision ID: james.westby@ubuntu.com-20080916121847-mg225rg5mnsdqzr0
Tags: 1.0-1ubuntu1
https://launchpad.net/bugs/264191
* Merge from Debian (LP: #264191), remaining changes:
  - Run test suite on build.

[Eddy Mulyono]
* Update patch to workaround network test case failures.

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tests/modeltests/many_to_many/models.py
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"""
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5. Many-to-many relationships
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To define a many-to-many relationship, use ManyToManyField().
 
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To define a many-to-many relationship, use ``ManyToManyField()``.
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In this example, an article can be published in multiple publications,
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and a publication has multiple articles.
 
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In this example, an ``Article`` can be published in multiple ``Publication``
 
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objects, and a ``Publication`` has multiple ``Article`` objects.
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"""
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from django.db import models
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class Publication(models.Model):
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    title = models.CharField(maxlength=30)
 
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    title = models.CharField(max_length=30)
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    def __str__(self):
 
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    def __unicode__(self):
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        return self.title
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    class Meta:
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        ordering = ('title',)
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class Article(models.Model):
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    headline = models.CharField(maxlength=100)
 
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    headline = models.CharField(max_length=100)
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    publications = models.ManyToManyField(Publication)
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    def __str__(self):
 
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    def __unicode__(self):
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        return self.headline
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    class Meta:
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# Create an Article.
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>>> a1 = Article(id=None, headline='Django lets you build Web apps easily')
 
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# You can't associate it with a Publication until it's been saved.
 
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>>> a1.publications.add(p1)
 
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Traceback (most recent call last):
 
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...
 
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ValueError: 'Article' instance needs to have a primary key value before a many-to-many relationship can be used.
 
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# Save it!
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>>> a1.save()
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# Associate the Article with a Publication.
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>>> Publication.objects.filter(article__in=[a1,a2]).distinct()
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[<Publication: Highlights for Children>, <Publication: Science News>, <Publication: Science Weekly>, <Publication: The Python Journal>]
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# Excluding a related item works as you would expect, too (although the SQL
 
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# involved is a little complex).
 
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>>> Article.objects.exclude(publications=p2)
 
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[<Article: Django lets you build Web apps easily>]
 
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# If we delete a Publication, its Articles won't be able to access it.
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>>> p1.delete()
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>>> Publication.objects.all()