diff -r 2e0b0af889be -r a04b1e4126c4 thirdparty/google_appengine/lib/django/tests/modeltests/many_to_many/models.py --- a/thirdparty/google_appengine/lib/django/tests/modeltests/many_to_many/models.py Sun Sep 06 23:31:53 2009 +0200 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,258 +0,0 @@ -""" -5. Many-to-many relationships - -To define a many-to-many relationship, use ManyToManyField(). - -In this example, an article can be published in multiple publications, -and a publication has multiple articles. -""" - -from django.db import models - -class Publication(models.Model): - title = models.CharField(maxlength=30) - - def __str__(self): - return self.title - - class Meta: - ordering = ('title',) - -class Article(models.Model): - headline = models.CharField(maxlength=100) - publications = models.ManyToManyField(Publication) - - def __str__(self): - return self.headline - - class Meta: - ordering = ('headline',) - -__test__ = {'API_TESTS':""" -# Create a couple of Publications. ->>> p1 = Publication(id=None, title='The Python Journal') ->>> p1.save() ->>> p2 = Publication(id=None, title='Science News') ->>> p2.save() ->>> p3 = Publication(id=None, title='Science Weekly') ->>> p3.save() - -# Create an Article. ->>> a1 = Article(id=None, headline='Django lets you build Web apps easily') ->>> a1.save() - -# Associate the Article with a Publication. ->>> a1.publications.add(p1) - -# Create another Article, and set it to appear in both Publications. ->>> a2 = Article(id=None, headline='NASA uses Python') ->>> a2.save() ->>> a2.publications.add(p1, p2) ->>> a2.publications.add(p3) - -# Adding a second time is OK ->>> a2.publications.add(p3) - -# Add a Publication directly via publications.add by using keyword arguments. ->>> new_publication = a2.publications.create(title='Highlights for Children') - -# Article objects have access to their related Publication objects. ->>> a1.publications.all() -[] ->>> a2.publications.all() -[, , , ] - -# Publication objects have access to their related Article objects. ->>> p2.article_set.all() -[] ->>> p1.article_set.all() -[, ] ->>> Publication.objects.get(id=4).article_set.all() -[] - -# We can perform kwarg queries across m2m relationships ->>> Article.objects.filter(publications__id__exact=1) -[, ] ->>> Article.objects.filter(publications__pk=1) -[, ] ->>> Article.objects.filter(publications=1) -[, ] ->>> Article.objects.filter(publications=p1) -[, ] - ->>> Article.objects.filter(publications__title__startswith="Science") -[, ] - ->>> Article.objects.filter(publications__title__startswith="Science").distinct() -[] - -# The count() function respects distinct() as well. ->>> Article.objects.filter(publications__title__startswith="Science").count() -2 - ->>> Article.objects.filter(publications__title__startswith="Science").distinct().count() -1 - ->>> Article.objects.filter(publications__in=[1,2]).distinct() -[, ] ->>> Article.objects.filter(publications__in=[1,p2]).distinct() -[, ] ->>> Article.objects.filter(publications__in=[p1,p2]).distinct() -[, ] - -# Reverse m2m queries are supported (i.e., starting at the table that doesn't -# have a ManyToManyField). ->>> Publication.objects.filter(id__exact=1) -[] ->>> Publication.objects.filter(pk=1) -[] - ->>> Publication.objects.filter(article__headline__startswith="NASA") -[, , , ] - ->>> Publication.objects.filter(article__id__exact=1) -[] ->>> Publication.objects.filter(article__pk=1) -[] ->>> Publication.objects.filter(article=1) -[] ->>> Publication.objects.filter(article=a1) -[] - ->>> Publication.objects.filter(article__in=[1,2]).distinct() -[, , , ] ->>> Publication.objects.filter(article__in=[1,a2]).distinct() -[, , , ] ->>> Publication.objects.filter(article__in=[a1,a2]).distinct() -[, , , ] - -# If we delete a Publication, its Articles won't be able to access it. ->>> p1.delete() ->>> Publication.objects.all() -[, , ] ->>> a1 = Article.objects.get(pk=1) ->>> a1.publications.all() -[] - -# If we delete an Article, its Publications won't be able to access it. ->>> a2.delete() ->>> Article.objects.all() -[] ->>> p2.article_set.all() -[] - -# Adding via the 'other' end of an m2m ->>> a4 = Article(headline='NASA finds intelligent life on Earth') ->>> a4.save() ->>> p2.article_set.add(a4) ->>> p2.article_set.all() -[] ->>> a4.publications.all() -[] - -# Adding via the other end using keywords ->>> new_article = p2.article_set.create(headline='Oxygen-free diet works wonders') ->>> p2.article_set.all() -[, ] ->>> a5 = p2.article_set.all()[1] ->>> a5.publications.all() -[] - -# Removing publication from an article: ->>> a4.publications.remove(p2) ->>> p2.article_set.all() -[] ->>> a4.publications.all() -[] - -# And from the other end ->>> p2.article_set.remove(a5) ->>> p2.article_set.all() -[] ->>> a5.publications.all() -[] - -# Relation sets can be assigned. Assignment clears any existing set members ->>> p2.article_set = [a4, a5] ->>> p2.article_set.all() -[, ] ->>> a4.publications.all() -[] ->>> a4.publications = [p3] ->>> p2.article_set.all() -[] ->>> a4.publications.all() -[] - -# Relation sets can be cleared: ->>> p2.article_set.clear() ->>> p2.article_set.all() -[] ->>> a4.publications.all() -[] - -# And you can clear from the other end ->>> p2.article_set.add(a4, a5) ->>> p2.article_set.all() -[, ] ->>> a4.publications.all() -[, ] ->>> a4.publications.clear() ->>> a4.publications.all() -[] ->>> p2.article_set.all() -[] - -# Relation sets can also be set using primary key values ->>> p2.article_set = [a4.id, a5.id] ->>> p2.article_set.all() -[, ] ->>> a4.publications.all() -[] ->>> a4.publications = [p3.id] ->>> p2.article_set.all() -[] ->>> a4.publications.all() -[] - -# Recreate the article and Publication we have deleted. ->>> p1 = Publication(id=None, title='The Python Journal') ->>> p1.save() ->>> a2 = Article(id=None, headline='NASA uses Python') ->>> a2.save() ->>> a2.publications.add(p1, p2, p3) - -# Bulk delete some Publications - references to deleted publications should go ->>> Publication.objects.filter(title__startswith='Science').delete() ->>> Publication.objects.all() -[, ] ->>> Article.objects.all() -[, , , ] ->>> a2.publications.all() -[] - -# Bulk delete some articles - references to deleted objects should go ->>> q = Article.objects.filter(headline__startswith='Django') ->>> print q -[] ->>> q.delete() - -# After the delete, the QuerySet cache needs to be cleared, and the referenced objects should be gone ->>> print q -[] ->>> p1.article_set.all() -[] - -# An alternate to calling clear() is to assign the empty set ->>> p1.article_set = [] ->>> p1.article_set.all() -[] - ->>> a2.publications = [p1, new_publication] ->>> a2.publications.all() -[, ] ->>> a2.publications = [] ->>> a2.publications.all() -[] - -"""}