#10249: Cannot create a consistent method resolution order (MRO) for bases
FieldFile, File
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Reporter: kmtracey | Owner: mitsuhiko
Status: closed | Milestone: 1.1
Component: Database layer (models, ORM) | Version: 1.2-beta
Resolution: fixed | Keywords:
Stage: Accepted | Has_patch: 0
Needs_docs: 0 | Needs_tests: 0
Needs_better_patch: 0 |
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Changes (by Marcelo_MV):
* cc: [email protected] (removed)
* cc: [email protected] (added)
* version: 1.0 => 1.2-beta
* component: File uploads/storage => Database layer (models, ORM)
Comment:
Hello everyone,
I was looking on google about this error and I found this tracker. Today,
I also tried to use multiple inheritance with a class used as a main class
for my Django admin classes. In my case I used djago-reversion package
(http://wiki.github.com/etianen/django-reversion/low-level-api) class
VersionAdmin? as the second class in the inheritance line. The code is as
follows:
class MuchTourModelAdmin?(admin.ModelAdmin?, VersionAdmin?):
#class body
However, after restarting the django runserver and trying to access my
site I got the following trace:
Traceback (most recent call last):
File "C:\Python25\Lib\site-packages\django\core\servers\basehttp.py",
line 674, in call
return self.application(environ, start_response)
File "C:\Python25\Lib\site-packages\django\core\handlers\wsgi.py",
line 241, in call
response = self.get_response(request)
File "C:\Python25\Lib\site-packages\django\core\handlers\base.py",
line 142, in get_response
return self.handle_uncaught_exception(request, resolver, exc_info)
File "C:\Python25\Lib\site-packages\django\core\handlers\base.py",
line 166, in handle_uncaught_exception
return debug.technical_500_response(request, *exc_info)
File "C:\Python25\Lib\site-packages\django\core\handlers\base.py",
line 80, in get_response
response = middleware_method(request)
File "C:\Python25\Lib\site-packages\django\middleware\common.py", line
57, in process_request
if (not _is_valid_path(request.path_info, urlconf) and
File "C:\Python25\Lib\site-packages\django\middleware\common.py", line
143, in _is_valid_path
urlresolvers.resolve(path, urlconf)
File "C:\Python25\Lib\site-packages\django\core\urlresolvers.py", line
301, in resolve
return get_resolver(urlconf).resolve(path)
File "C:\Python25\Lib\site-packages\django\core\urlresolvers.py", line
214, in resolve
for pattern in self.url_patterns:
File "C:\Python25\Lib\site-packages\django\core\urlresolvers.py", line
243, in _get_url_patterns
patterns = getattr(self.urlconf_module, "urlpatterns",
self.urlconf_module)
File "C:\Python25\Lib\site-packages\django\core\urlresolvers.py", line
238, in _get_urlconf_module
self._urlconf_module = import_module(self.urlconf_name)
File "C:\Python25\Lib\site-packages\django\utils\importlib.py", line
35, in import_module
import(name)
File "C:\doisxt\muchtour\djsite\urls.py", line 18, in <module>
admin.autodiscover()
File "C:\Python25\Lib\site-packages\django\contrib\admin\init.py",
line 24, in autodiscover
import_module('%s.admin' % app)
File "C:\Python25\Lib\site-packages\django\utils\importlib.py", line
35, in import_module
import(name)
File "C:\doisxt\muchtour\djsite\admin\cidade\admin.py", line 13, in
<module>
from djsite.util.admin import MuchTourModelAdmin?
File "C:\doisxt\muchtour\djsite\util\admin.py", line 48, in <module>
class MuchTourModelAdmin?(admin.ModelAdmin?, VersionAdmin?):
File "C:\Python25\Lib\site-packages\django\forms\widgets.py", line
127, in new
attrs)
TypeError?: Error when calling the metaclass bases
Cannot create a consistent method resolution
order (MRO) for bases ModelAdmin?, VersionAdmin?
If I change the order of the inheritance line it works fine, even though I
haven't tested the whole system:
class MuchTourModelAdmin?(VersionAdmin?, admin.ModelAdmin?):
#class body
Django version: Django version 1.2.1 SVN-202
Perhaps I didn't pay enought attention in some subject discussed above. Is
there anything I should do? I'm a bit concerned about the possibility that
this error could arise again, even changing the inheritance order.
Thanks to all. Regards.
--
Ticket URL: <http://code.djangoproject.com/ticket/10249#comment:9>
Django <http://code.djangoproject.com/>
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