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-rewrite-urls-messing-up-on-deployment-setups 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 "/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 "/home/nandu/django/swanlotus/swanlotus_site/templatetags/ custom_tags.py" in render 16. path = super(SubdomainURLNode, self).render(context) File "/usr/local/lib/python2.6/dist-packages/django/template/ defaulttags.py" in render 442. url = reverse(project_name + '.' + view_name, Exception Type: TemplateSyntaxError at / Exception Value: Caught TypeError while rendering: cannot concatenate 'str' and 'FilterExpression' objects -- You received this message because you are subscribed to the Google Groups "Django users" group. 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