"Complex" Syndication Example Error?

[gtaylor@…]

Following the example at: ​http://www.djangoproject.com/documentation/syndication_feeds/#a-complex-example

I've arrived at the following:

class BpostCatPosts(Feed):
    """
    Shows the latest blog posts from an individual blog post category.
    """
    def get_object(self, bits):
        # In case of "/feeds/bpcatposts/0613/foo/bar/baz/", or other such clutter,
        # check that bits has only one member.
        if len(bits) != 1:
            raise ObjectDoesNotExist
        
        return BlogCategory.objects.get(id__exact=2)
     
    def title(self, obj):
        return "Greg Taylor's Latest: %s" % obj.name
     
    def link(self, obj):
        if not obj:
            raise FeedDoesNotExist
        return obj.get_absolute_url()
    
    def description(self, obj):
        return "The latest posts from the %s category of Greg Taylor's blog." % obj.name
    
    def items(self, obj):
        return BlogPost.objects.filter(category=[obj.id])[:10]

My feed section of urls.py looks like this:

feeds = {
    'latest_bpost': LatestBposts,
    'latest_bpostcat': BpostCatPosts,
}

urlpatterns = patterns('',
    # Serve Media via Django
    (r'^media/(?P<path>.*)$', 'django.views.static.serve', {'document_root': settings.MEDIA_ROOT}),
    # Default Page
    (r'^', include('apps.pages.urls')),
    # Standard Pages
    (r'^pages/', include('apps.pages.urls')),
    # Blog URLs
    (r'^blog/', include('apps.blog.urls')),
    # Django Admin Interface
    (r'^admin/', include('django.contrib.admin.urls')),
    # RSS Feeds
    (r'^feeds/(?P<url>.*)/$', 'django.contrib.syndication.views.feed', {'feed_dict': feeds}),
)

When visiting the URL ​http://localhost:8000/feeds/latest_bpostcat/2/ I am getting the following error:

InterfaceError at /feeds/latest_bpostcat/2/
Error binding parameter 0 - probably unsupported type.

I've looked over this quite a few times and can't figure out if the API has changed or if there was an omission. I've tried my best to assure that the error wasn't on my part.

[anonymous]

Oh, I missed part of the error message that may help:

InterfaceError at /feeds/latest_bpostcat/2/
Error binding parameter 0 - probably unsupported type.
Request Method: 	GET
Request URL: 	http://localhost:8000/feeds/latest_bpostcat/2/
Exception Type: 	InterfaceError
Exception Value: 	Error binding parameter 0 - probably unsupported type.
Exception Location: 	C:\Python25\lib\site-packages\django\db\backends\sqlite3\base.py in execute, line 133
Python Executable: 	C:\Python25\python.exe
Python Version: 	2.5.1
Python Path: 	['C:\\Documents and Settings\\Greg Taylor\\eclipse_workspace\\gsite', 'C:\\WINDOWS\\system32\\python25.zip', 'C:\\Python25\\DLLs', 'C:\\Python25\\lib', 'C:\\Python25\\lib\\plat-win', 'C:\\Python25\\lib\\lib-tk', 'C:\\Python25', 'C:\\Python25\\lib\\site-packages', 'C:\\Python25\\lib\\site-packages\\Numeric', 'C:\\Python25\\lib\\site-packages\\PIL']

Environment:

Request Method: GET
Request URL: http://localhost:8000/feeds/latest_bpostcat/2/
Django Version: 0.97-pre-SVN-7054
Python Version: 2.5.1
Installed Applications:
['django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'apps.blog',
 'apps.pages']
Installed Middleware:
('django.middleware.common.CommonMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.middleware.doc.XViewMiddleware')


Traceback:
File "C:\Python25\lib\site-packages\django\core\handlers\base.py" in get_response
  82.                 response = callback(request, *callback_args, **callback_kwargs)
File "C:\Python25\lib\site-packages\django\contrib\syndication\views.py" in feed
  19.         feedgen = f(slug, request).get_feed(param)
File "C:\Python25\lib\site-packages\django\contrib\syndication\feeds.py" in get_feed
  105.         for item in self.__get_dynamic_attr('items', obj):
File "C:\Python25\lib\site-packages\django\db\models\query.py" in __iter__
  114.         return iter(self._get_data())
File "C:\Python25\lib\site-packages\django\db\models\query.py" in _get_data
  483.             self._result_cache = list(self.iterator())
File "C:\Python25\lib\site-packages\django\db\models\query.py" in iterator
  189.         cursor.execute("SELECT " + (self._distinct and "DISTINCT " or "") + ",".join(select) + sql, params)
File "C:\Python25\lib\site-packages\django\db\backends\util.py" in execute
  18.             return self.cursor.execute(sql, params)
File "C:\Python25\lib\site-packages\django\db\backends\sqlite3\base.py" in execute
  133.         return Database.Cursor.execute(self, query, params)

Exception Type: InterfaceError at /feeds/latest_bpostcat/2/
Exception Value: Error binding parameter 0 - probably unsupported type.

[Malcolm Tredinnick]

This is an error in your code. Run this line

BlogPost.objects.filter(category=[obj.id])[:10]

in the Django shell and you'll see the same error. You probably want to use the __in lookup type there.

[James Bennett]

(In [7302]) Fixed #6541: Corrected documentation of how the admin chooses a default manager. Refs #6538.