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/m2o_recursive/models.py

@@ -0,0 +1,44 @@
+"""
+11. Relating an object to itself, many-to-one
+
+To define a many-to-one relationship between a model and itself, use
+``ForeignKey('self')``.
+
+In this example, a ``Category`` is related to itself. That is, each
+``Category`` has a parent ``Category``.
+
+Set ``related_name`` to designate what the reverse relationship is called.
+"""
+
+from django.core import meta
+
+class Category(meta.Model):
+    name = meta.CharField(maxlength=20)
+    parent = meta.ForeignKey('self', null=True, related_name='child')
+    class META:
+        module_name = 'categories'
+
+    def __repr__(self):
+        return self.name
+
+API_TESTS = """
+# Create a few Category objects.
+>>> r = Category(id=None, name='Root category', parent=None)
+>>> r.save()
+>>> c = Category(id=None, name='Child category', parent=r)
+>>> c.save()
+
+>>> r.get_child_list()
+[Child category]
+>>> r.get_child(name__startswith='Child')
+Child category
+>>> r.get_parent()
+Traceback (most recent call last):
+    ...
+DoesNotExist
+
+>>> c.get_child_list()
+[]
+>>> c.get_parent()
+Root category
+"""