django registration redux URL's being effected by url with multiple query parameters

Question

My Url's supplied by django registration redux don't work when the following url is used:

url(r'^(?P<username>\w+)/(?P<slug>[-\w]+)/$', views.project_page, name='user_project'),

but then they do work if I add another level to that url like this:

url(r'^projects/(?P<username>\w+)/(?P<slug>[-\w]+)/$', views.project_page, name='user_project'),

I don't want to add that extra project/ url level in there if possible. Why would it be effecting the django registration redux url's and how can I fix it? Any help would be much appreciated :-)

project urls

from django.conf.urls import patterns, include, url
from django.contrib import admin
from django.conf import settings
from registration.backends.simple.views import RegistrationView

class MyRegistrationView(RegistrationView):  #redirects to home page after registration
    def get_success_url(self,request, user):
        return '/register_profile'

urlpatterns = patterns('',

    url(r'^admin/', include(admin.site.urls)),
    url(r'', include('howdidu.urls')),
    url(r'^accounts/register/$', MyRegistrationView.as_view(), name='registration_register'), #redirects to home page after registration
    (r'^accounts/', include('registration.backends.simple.urls')),

)

# media
if settings.DEBUG:
    urlpatterns += patterns(
        'django.views.static',
        (r'^media/(?P<path>.*)',
        'serve',
        {'document_root': settings.MEDIA_ROOT}), )

app urls

from django.conf.urls import patterns, url
from howdidu import views
from django.contrib.auth.decorators import login_required

urlpatterns = patterns('',
        url(r'^$', views.index, name='index'),
        url(r'^register_profile/$', views.register_profile, name='register_profile'),
        url(r'^update_profile/$', views.update_profile, name='update_profile'),
        url(r'^create_project/$', login_required(views.CreateProject.as_view()), name='create_project'),
        url(r'^(?P<username>\w+)/$', views.profile_page, name='user_profile'),
        url(r'^(?P<username>\w+)/(?P<slug>[-\w]+)/$', views.project_page, name='user_project'),
        )

Answer 1

The problem is your url ordering, take a look at this:

url(r'^admin/', include(admin.site.urls)),
url(r'', include('howdidu.urls')),
url(r'^accounts/register/$', MyRegistrationView.as_view(), name='registration_register'), #redirects to home page after registration
url(r'^accounts/', include('registration.backends.simple.urls')),

Especially this:

url(r'', include('howdidu.urls')),

this url matches everything, so basically Django will go from the top to the bottom and if it doesn't find any match before url(r'', include('howdidu.urls')), it will match anything to it. This means that you will never match

url(r'^accounts/register/$', MyRegistrationView.as_view(), name='registration_register'), #redirects to home page after registration
url(r'^accounts/', include('registration.backends.simple.urls')),

One way to fix it is to place url(r'', include('howdidu.urls')) at the very bottom of the urls:

url(r'^admin/', include(admin.site.urls)),
url(r'^accounts/register/$', MyRegistrationView.as_view(), name='registration_register'), #redirects to home page after registration
url(r'^accounts/', include('registration.backends.simple.urls')),
url(r'^', include('howdidu.urls')),

and another way is to set another url level for url(r'^', include('howdidu.urls')):

url(r'^admin/', include(admin.site.urls)),
url(r'^howdidu/', include('howdidu.urls')),
url(r'^accounts/register/$', MyRegistrationView.as_view(), name='registration_register'), #redirects to home page after registration
url(r'^accounts/', include('registration.backends.simple.urls')),