Merged regressiontests and modeltests into the test root.

tests/m2m_multiple/models.py

@@ -0,0 +1,34 @@
+"""
+20. Multiple many-to-many relationships between the same two tables
+
+In this example, an ``Article`` can have many "primary" ``Category`` objects
+and many "secondary" ``Category`` objects.
+
+Set ``related_name`` to designate what the reverse relationship is called.
+"""
+
+from django.db import models
+from django.utils.encoding import python_2_unicode_compatible
+
+
+@python_2_unicode_compatible
+class Category(models.Model):
+    name = models.CharField(max_length=20)
+    class Meta:
+       ordering = ('name',)
+
+    def __str__(self):
+        return self.name
+
+@python_2_unicode_compatible
+class Article(models.Model):
+    headline = models.CharField(max_length=50)
+    pub_date = models.DateTimeField()
+    primary_categories = models.ManyToManyField(Category, related_name='primary_article_set')
+    secondary_categories = models.ManyToManyField(Category, related_name='secondary_article_set')
+    class Meta:
+       ordering = ('pub_date',)
+
+    def __str__(self):
+        return self.headline
+