magic-removal: Moved model unit tests from 'testapp' package into 'modeltests' package, with each model test getting its own app

git-svn-id: http://code.djangoproject.com/svn/django/branches/magic-removal@1606 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/modeltests/m2m_intermediary/models.py

@@ -0,0 +1,68 @@
+"""
+9. Many-to-many relationships via an intermediary table
+
+For many-to-many relationships that need extra fields on the intermediary
+table, use an intermediary model.
+
+In this example, an ``Article`` can have multiple ``Reporter``s, and each
+``Article``-``Reporter`` combination (a ``Writer``) has a ``position`` field,
+which specifies the ``Reporter``'s position for the given article (e.g. "Staff
+writer").
+"""
+
+from django.core import meta
+
+class Reporter(meta.Model):
+    first_name = meta.CharField(maxlength=30)
+    last_name = meta.CharField(maxlength=30)
+
+    def __repr__(self):
+        return "%s %s" % (self.first_name, self.last_name)
+
+class Article(meta.Model):
+    headline = meta.CharField(maxlength=100)
+    pub_date = meta.DateField()
+
+    def __repr__(self):
+        return self.headline
+
+class Writer(meta.Model):
+    reporter = meta.ForeignKey(Reporter)
+    article = meta.ForeignKey(Article)
+    position = meta.CharField(maxlength=100)
+
+    def __repr__(self):
+        return '%r (%s)' % (self.get_reporter(), self.position)
+
+API_TESTS = """
+# Create a few Reporters.
+>>> r1 = Reporter(first_name='John', last_name='Smith')
+>>> r1.save()
+>>> r2 = Reporter(first_name='Jane', last_name='Doe')
+>>> r2.save()
+
+# Create an Article.
+>>> from datetime import datetime
+>>> a = Article(headline='This is a test', pub_date=datetime(2005, 7, 27))
+>>> a.save()
+
+# Create a few Writers.
+>>> w1 = Writer(reporter=r1, article=a, position='Main writer')
+>>> w1.save()
+>>> w2 = Writer(reporter=r2, article=a, position='Contributor')
+>>> w2.save()
+
+# Play around with the API.
+>>> a.get_writer_list(order_by=['-position'], select_related=True)
+[John Smith (Main writer), Jane Doe (Contributor)]
+>>> w1.get_reporter()
+John Smith
+>>> w2.get_reporter()
+Jane Doe
+>>> w1.get_article()
+This is a test
+>>> w2.get_article()
+This is a test
+>>> r1.get_writer_list()
+[John Smith (Main writer)]
+"""