From 7b63d3d3b4fcf58070ced8e7a8c766cc93a26420 Mon Sep 17 00:00:00 2001
From: Russell Keith-Magee <russell@keith-magee.com>
Date: Thu, 5 Nov 2009 11:57:28 +0000
Subject: [PATCH] Fixed #12168 -- Corrected the registration of m2m autocreated
 models when models.py is split into submodules. Thanks to Jens Diemer for the
 report and test case.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@11724 bcc190cf-cafb-0310-a4f2-bffc1f526a37
---
 django/db/models/fields/related.py            | 11 +++++-
 tests/modeltests/model_package/__init__.py    |  1 +
 .../model_package/models/__init__.py          |  3 ++
 .../model_package/models/article.py           | 10 ++++++
 .../model_package/models/publication.py       |  7 ++++
 tests/modeltests/model_package/tests.py       | 34 +++++++++++++++++++
 6 files changed, 65 insertions(+), 1 deletion(-)
 create mode 100644 tests/modeltests/model_package/__init__.py
 create mode 100644 tests/modeltests/model_package/models/__init__.py
 create mode 100644 tests/modeltests/model_package/models/article.py
 create mode 100644 tests/modeltests/model_package/models/publication.py
 create mode 100644 tests/modeltests/model_package/tests.py

diff --git a/django/db/models/fields/related.py b/django/db/models/fields/related.py
index e8a4b98481..c4bd9fb983 100644
--- a/django/db/models/fields/related.py
+++ b/django/db/models/fields/related.py
@@ -829,9 +829,18 @@ def create_many_to_many_intermediary_model(field, klass):
         'auto_created': klass,
         'unique_together': (from_, to)
     })
+    # If the models have been split into subpackages, klass.__module__
+    # will be the subpackge, not the models module for the app. (See #12168)
+    # Compose the actual models module name by stripping the trailing parts
+    # of the namespace until we find .models
+    parts = klass.__module__.split('.')
+    while parts[-1] != 'models':
+        parts.pop()
+    module = '.'.join(parts)
+    # Construct and return the new class.
     return type(name, (models.Model,), {
         'Meta': meta,
-        '__module__': klass.__module__,
+        '__module__': module,
         from_: models.ForeignKey(klass, related_name='%s+' % name),
         to: models.ForeignKey(to_model, related_name='%s+' % name)
     })
diff --git a/tests/modeltests/model_package/__init__.py b/tests/modeltests/model_package/__init__.py
new file mode 100644
index 0000000000..8b13789179
--- /dev/null
+++ b/tests/modeltests/model_package/__init__.py
@@ -0,0 +1 @@
+
diff --git a/tests/modeltests/model_package/models/__init__.py b/tests/modeltests/model_package/models/__init__.py
new file mode 100644
index 0000000000..91e1b02e7d
--- /dev/null
+++ b/tests/modeltests/model_package/models/__init__.py
@@ -0,0 +1,3 @@
+# Import all the models from subpackages
+from article import Article
+from publication import Publication
diff --git a/tests/modeltests/model_package/models/article.py b/tests/modeltests/model_package/models/article.py
new file mode 100644
index 0000000000..c8fae1c72d
--- /dev/null
+++ b/tests/modeltests/model_package/models/article.py
@@ -0,0 +1,10 @@
+from django.db import models
+from django.contrib.sites.models import Site
+
+class Article(models.Model):
+    sites = models.ManyToManyField(Site)
+    headline = models.CharField(max_length=100)
+    publications = models.ManyToManyField("model_package.Publication", null=True, blank=True,)
+
+    class Meta:
+        app_label = 'model_package'
diff --git a/tests/modeltests/model_package/models/publication.py b/tests/modeltests/model_package/models/publication.py
new file mode 100644
index 0000000000..4dc2d6a148
--- /dev/null
+++ b/tests/modeltests/model_package/models/publication.py
@@ -0,0 +1,7 @@
+from django.db import models
+
+class Publication(models.Model):
+    title = models.CharField(max_length=30)
+
+    class Meta:
+        app_label = 'model_package'
diff --git a/tests/modeltests/model_package/tests.py b/tests/modeltests/model_package/tests.py
new file mode 100644
index 0000000000..6e8c158a68
--- /dev/null
+++ b/tests/modeltests/model_package/tests.py
@@ -0,0 +1,34 @@
+"""
+>>> from models.publication import Publication
+>>> from models.article import Article
+>>> from django.contrib.auth.views import Site
+
+>>> p = Publication(title="FooBar")
+>>> p.save()
+>>> p
+<Publication: Publication object>
+
+>>> from django.contrib.sites.models import Site
+>>> current_site = Site.objects.get_current()
+>>> current_site
+<Site: example.com>
+
+# Regression for #12168: models split into subpackages still get M2M tables
+
+>>> a = Article(headline="a foo headline")
+>>> a.save()
+>>> a.publications.add(p)
+>>> a.sites.add(current_site)
+>>> a.save()
+
+>>> a = Article.objects.get(id=1)
+>>> a
+<Article: Article object>
+>>> a.id
+1
+>>> a.sites.count()
+1
+
+"""
+
+