Django NoReverseMatch error

I am new to Django and have started working on a mature Django project.

I want to add a new page to the user account screens, and link to it. But I am getting a NoReverseMatch error.

To /users/urls.py I added:

url(r'^panel/history$',
    'theproject.users.views.history',
    name='account开发者_StackOverflow社区_history'
),

...which is consistent with the line above it:

url(r'^panel$',
    'theproject.users.views.control_panel',
    name='account_panel'
),

To /users/views.py I added:

@login_required
def history(request):
    return render_to_response('users/ourbrand_history.html', {},
    context_instance=RequestContext(request))

...which is consistent with the line above it:

@login_required
def control_panel(request):
    return render_to_response('users/ourbrand_panel.html', {},
    context_instance=RequestContext(request))

To /templates/users/ourbrand_panel.html I added:

<a href="{% url account_history %}">History</a>

...which is consistent with the line above it:

<a href="{% url account_panel %}">Home</a>

Now when I load /panel I get a TemplateSyntaxError: NoReverseMatch.

Reverse for 'account_history' with arguments '()' and keyword arguments '{}' not found.

UPDATE: As a test, I removed my link in the template -- and /panel loads fine. If I then delete /users/urls.py and /users/views.py /panel still loads. I have deleted all cookies, history etc. Do I have to run a command at the terminal (like rake in ruby) to commit changes to urls.py? Or should changes 'just work'?

Try:

{% url users.views.control_panel %}
{% url users.views.history %}

in the template and change:

url(r'^panel/history/$','theproject.users.views.history',name='account_history'),
url(r'^panel/$','theproject.users.views.control_panel',name='account_panel'),

           ^

in the urls. (notice the trailing slashes in the first argument.)

If you're using mod_wsgi, then a simple:

$ touch /path/to/your/wsgi_file.wsgi

Should do the trick (without having to restart the server).

Move this:

url(r'^panel/history/$',
    'theproject.users.views.history',
    name='account_history'
),

from the users/urls.py to the project level urls.py.

It could be that the users/urls.py is not linked to from the main urls.py that also defines a view for /panel/

Answering my own question (based on help provided here)...

Since the server is production, changes to urls.py do not have any effect until the server is restarted. Currently I do not have su access so cannot apachectl restart but it appears this will resolve the issue.