From 808aa3b89de27edb670fa03077488580c34d529a Mon Sep 17 00:00:00 2001
From: Alex Gaynor <alex.gaynor@gmail.com>
Date: Tue, 15 Dec 2009 08:25:58 +0000
Subject: [PATCH] [soc2009/multidb] Added backwards compatibility layer for
 contrib.gis.  Patch from Russell Keith-Magee.

git-svn-id: http://code.djangoproject.com/svn/django/branches/soc2009/multidb@11868 bcc190cf-cafb-0310-a4f2-bffc1f526a37
---
 TODO                  |  3 ---
 django/db/__init__.py | 24 +++++++++++++++++++-----
 2 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/TODO b/TODO
index 4a0aad16cb..3c6b97be1c 100644
--- a/TODO
+++ b/TODO
@@ -4,9 +4,6 @@ Django Multiple Database TODO List
 Required for v1.2
 ~~~~~~~~~~~~~~~~~
 
- * Finalize the sql.Query internals
-   * Clean up the use of db.backend.query_class()
-   * Verify it still works with GeoDjango
  * Modify the admin interface to support multiple databases (doh).
 
 Optional for v1.2
diff --git a/django/db/__init__.py b/django/db/__init__.py
index 358b431457..d8f20ee278 100644
--- a/django/db/__init__.py
+++ b/django/db/__init__.py
@@ -36,12 +36,26 @@ if DEFAULT_DB_ALIAS not in settings.DATABASES:
 
 for database in settings.DATABASES.values():
     if database['ENGINE'] in ("postgresql", "postgresql_psycopg2", "sqlite3", "mysql", "oracle"):
-        database['ENGINE'] = "django.db.backends.%s" % database['ENGINE']
         import warnings
-        warnings.warn(
-            "Short names for DATABASE_ENGINE are deprecated; prepend with 'django.db.backends.'",
-            PendingDeprecationWarning
-        )
+        if 'django.contrib.gis' in settings.INSTALLED_APPS:
+            warnings.warn(
+                "django.contrib.gis is now implemented as a full database backend.\n"
+                "Modify DATABASE_ENGINE to select a backend from 'django.contrib.gis.db.backends'",
+                PendingDeprecationWarning
+            )
+            if database['ENGINE'] == 'postgresql_psycopg2':
+                full_engine = 'django.contrib.gis.db.backends.postgis'
+            elif database['ENGINE'] == 'sqlite3':
+                full_engine = 'django.contrib.gis.db.backends.spatialite'
+            else:
+                full_engine = 'django.contrib.gis.db.backends.%s' % database['ENGINE']
+        else:
+            warnings.warn(
+                "Short names for DATABASE_ENGINE are deprecated; prepend with 'django.db.backends.'",
+                PendingDeprecationWarning
+            )
+            full_engine = "django.db.backends.%s" % database['ENGINE']
+        database['ENGINE'] = full_engine
 
 connections = ConnectionHandler(settings.DATABASES)