AT, Thank you very much for your detailed answer. I have managed to get it to work now and it seemed obvious after your explanation.
Thank you once again. Yours sincerely, nav On Oct 18, 9:11 pm, Andre Terra <[email protected]> wrote: > Hello, nav > > The most relevant lines in your traceback are: > > Template error: > > In template /home/nandu/django/swanlotus/templates/navigation.html, error at > line 6 > > Caught TypeError while rendering: cannot concatenate 'str' and > 'FilterExpression' objects > > 1 : {% load custom_tags %} > 2 : {% load url from future %} > > (...) > > 6 : <li><a href=' {% subdomainurl "swanlotus_site.views.view_decider" > "about" %} '>About Us</a> > > File "/usr/local/lib/python2.6/dist-packages/django/template/defaulttags.py" > in render > 442. url = reverse(project_name + '.' + view_name, > > Which basically means project_name and view_name cannot be concatenated (as > attempted on line 442 of defaulttags.py). > > If I had to guess, I'd say the problem is due to the fact that you're > subclassing URLNode to create your custom {% subdomainurl %} tag, but also > trying to {% load url from future %}. > > Loading the new url (which takes a string/variable as the first argument > rather than a constant [1]) could indeed lead you to believe {% subdomainurl > %} would behave the same way, but SubdomainURLNode (which is in your > custom_tags) actually subclasses the "old" (current) URLNode class. > > If you want {% subdomainurl %} to be future-proof as well, then you will > need to either modify it to subclass django.templatetags.future.URLNode [2]. > Another solution would be to create a second {% subdomainurl %}, that > inherits from future.URLNode. Perhaps you could even split your custom tags > into two separate libraries (one of them named custom_future or whatever) > and allow for a syntax similar to the one you use to load {% url %}. > > On a side note, I'd recommend choosing a better name than "custom_tags" > because that sounds too generic. You can have as many templatetags modules > as you'd like, so don't be afraid to organize your tags in different files! > > Let us know if you have any other questions and good luck. > > Cheers, > AT > > [1]https://docs.djangoproject.com/en/dev/ref/templates/builtins/?from=ol... > [2]https://code.djangoproject.com/browser/django/trunk/django/templateta... > > On Tue, Oct 18, 2011 at 12:06 PM, nav <[email protected]> wrote: > > AT, > > > Thanks for your email I have posted the custom template tag code and > > the traceback at dpaste. The template code is at: > > >http://dpaste.com/636570/ > > > the traceback is at: > > >http://dpaste.com/636571/ > > > Please do let me know if anything else is required. > > > Thanks, > > nav > > > On Oct 18, 5:20 pm, Andre Terra <[email protected]> wrote: > > > Please post your code again on something likehttp://dpaste.comandI'll > > > gladly take a look > > > > Cheers, > > > AT > > > > On Tue, Oct 18, 2011 at 9:43 AM, nav <[email protected]> wrote: > > > > If anyone has any pointers as to what might be the problem please > > > > answer. I would greatly appreciate any help you maybe able to provide. > > > > > Thanks. > > > > nav > > > > > On Oct 17, 11:44 pm, nav <[email protected]> wrote: > > > > > Dear Folks, > > > > > > I am using a number of subdomains for my website and decided to > > create > > > > > a custom url tag and try as shown on > > >http://stackoverflow.com/questions/3461806/django-subdomains-and-mod-... > > > > > > My template tag being used in my template like this: > > > > > <a href='{% subdomainurl "app.views.view_decider" "about" %}'>About > > > > > Us</a> > > > > > > My template tags functions looks like this: > > > > > > class SubdomainURLNode(URLNode): > > > > > def render(self, context): > > > > > request = context['request'] > > > > > domain = request.get_host() > > > > > subdomain = re.sub(r'^www\.','',domain).split('.')[0] > > > > > path = super(SubdomainURLNode, self).render(context) > > > > > return "%s/%s" % (str(request.get_host()), path) > > > > > > @register.tag > > > > > def subdomainurl(parser, token, node_cls=SubdomainURLNode): > > > > > """Just like {% url %} but checks for a subdomain.""" > > > > > node_instance = url(parser, token) > > > > > return node_cls(view_name=node_instance.view_name, > > > > > args=node_instance.args, > > > > > kwargs=node_instance.kwargs, > > > > > asvar=node_instance.asvar) > > > > > > While trying to render the template tag it comes back saying: > > > > > > TemplateSyntaxError at / > > > > > > Caught TypeError while rendering: cannot concatenate 'str' and > > > > > 'FilterExpression' objects > > > > > > My template tag function does not return the path value from the > > > > > statement: > > > > > path = super(SubdomainURLNode, self).render(context) > > > > > > because the URLNode function fails on line 442 because of a type > > > > > mismatch: > > > > > url = reverse(project_name + '.' + view_name, > > > > > > I just tried using the standard url method in django {% url > > > > > "app.views.view_decider" "about" %} and this works. I would like to > > > > > know where I am going wrong with my function so I can get this to > > > > > work. > > > > > > The full traceback of the error is below: > > > > > > Thanks in advance. > > > > > nav > > > > > > The full traceback of the error is below: > > > > > ------------------------------------------------------------------ > > > > > Environment: > > > > > > Request Method: GET > > > > > Request URL:http://localhost:8000/ > > > > > > Django Version: 1.3.1 > > > > > Python Version: 2.6.6 > > > > > Installed Applications: > > > > > ['django.contrib.auth', > > > > > 'django.contrib.contenttypes', > > > > > 'django.contrib.sessions', > > > > > 'django.contrib.sites', > > > > > 'django.contrib.messages', > > > > > 'django.contrib.staticfiles', > > > > > 'django.contrib.admin', > > > > > 'swanlotus_site', > > > > > 'south'] > > > > > Installed Middleware: > > > > > ('django.middleware.common.CommonMiddleware', > > > > > 'django.contrib.sessions.middleware.SessionMiddleware', > > > > > 'django.middleware.csrf.CsrfViewMiddleware', > > > > > 'django.contrib.auth.middleware.AuthenticationMiddleware', > > > > > 'django.contrib.messages.middleware.MessageMiddleware', > > > > > 'middleware.SubdomainMiddleware') > > > > > > Template error: > > > > > In template /home/nandu/django/swanlotus/templates/navigation.html, > > > > > error at line 6 > > > > > Caught TypeError while rendering: cannot concatenate 'str' and > > > > > 'FilterExpression' objects > > > > > 1 : {% load custom_tags %} > > > > > > 2 : {% load url from future %} > > > > > > 3 : <ul> > > > > > > 4 : <li><a href="http://localhost:8000/";>Home</a></li> > > > > > > 5 : <!-- <li><a href="http://localhost:8000/about";>About > > Us</a> > > > > > --> > > > > > > 6 : <li><a href=' {% subdomainurl > > > > > "swanlotus_site.views.view_decider" "about" %} '>About Us</a> > > > > > > 7 : <ul> > > > > > > 8 : <li><a href="http://chandra.localhost: > > > > > 8000">Chandra</a></li> > > > > > > 9 : </ul> > > > > > > 10 : </li> > > > > > > 11 : <li><a href="http://downloads.localhost:8000 > > ">Downloads</ > > > > > a> > > > > > > 12 : {% if thesis and phd_guide%} > > > > > > 13 : <ul> > > > > > > 14 : <li><a href=" > >http://downloads.localhost:8000/ > > > > > #thesis">Thesis Writing</a></li> > > > > > > 15 : <li><a href=" > >http://downloads.localhost:8000/ > > > > > #phd">PhD Guide</a></li> > > > > > > 16 : {% if calculus_sheet and app_maths_sheet %} > > > > > > Traceback: > > > > > File "/usr/local/lib/python2.6/dist-packages/django/core/handlers/ > > > > > base.py" in get_response > > > > > 111. response = callback(request, > > > > > *callback_args, **callback_kwargs) > > > > > File "/home/nandu/django/swanlotus/swanlotus_site/views.py" in > > > > > view_decider > > > > > 21. return render(request, template, context) > > > > > File "/usr/local/lib/python2.6/dist-packages/django/shortcuts/ > > > > > __init__.py" in render > > > > > 44. return HttpResponse(loader.render_to_string(*args, > > > > > **kwargs), > > > > > File "/usr/local/lib/python2.6/dist-packages/django/template/ > > > > > loader.py" in render_to_string > > > > > 188. return t.render(context_instance) > > > > > File "/usr/local/lib/python2.6/dist-packages/django/template/base.py" > > > > > in render > > > > > 123. return self._render(context) > > > > > File "/usr/local/lib/python2.6/dist-packages/django/template/base.py" > > > > > in _render > > > > > 117. return self.nodelist.render(context) > > > > > File "/usr/local/lib/python2.6/dist-packages/django/template/base.py" > > > > > in render > > > > > 744. bits.append(self.render_node(node, context)) > > > > > File > > "/usr/local/lib/python2.6/dist-packages/django/template/debug.py" > > > > > in render_node > > > > > 73. result = node.render(context) > > > > > File "/usr/local/lib/python2.6/dist-packages/django/template/ > > > > > loader_tags.py" in render > > > > > 127. return compiled_parent._render(context) > > > > > File "/usr/local/lib/python2.6/dist-packages/django/template/base.py" > > > > > in _render > > > > > 117. return self.nodelist.render(context) > > > > > File "/usr/local/lib/python2.6/dist-packages/django/template/base.py" > > > > > in render > > > > > 744. bits.append(self.render_node(node, context)) > > > > > File > > "/usr/local/lib/python2.6/dist-packages/django/template/debug.py" > > > > > in render_node > > > > > 73. result = node.render(context) > > > > > File "/usr/local/lib/python2.6/dist-packages/django/template/ > > > > > loader_tags.py" in render > > > > > 159. return self.render_template(self.template, context) > > > > > File "/usr/local/lib/python2.6/dist-packages/django/template/ > > > > > loader_tags.py" in render_template > > > > > 141. output = template.render(context) > > > > > File "/usr/local/lib/python2.6/dist-packages/django/template/base.py" > > > > > in render > > > > > 123. return self._render(context) > > > > > File > > ... > > read more » -- You received this 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