librelist archives

url_for build error

From:

Rob Pfeifer

Date:

2012-01-25 @ 17:59

I keep getting a builderror when trying to create a link that drives
url_for with a variable. Weird part is if I reload a couple times sometimes
it will work, and then it will crash again if I go back to the main page.
Wondering if it's the function definition, the template or some
combination? Any thoughts would be greatly appreciated.
Thanks,
 Rob

[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128] mod_wsgi
(pid=30872): Exception occurred processing WSGI script '/srv/www/
myproject.com/myproject.wsgi'., referer: http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128] Traceback (most
recent call last):, referer: http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]   File
"/usr/lib/python2.7/dist-packages/flask/app.py", line 1306, in __call__,
referer: http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]     return
self.wsgi_app(environ, start_response), referer: http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]   File
"/usr/lib/python2.7/dist-packages/flask/app.py", line 1294, in wsgi_app,
referer: http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]     response =
self.make_response(self.handle_exception(e)), referer: http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]   File
"/usr/lib/python2.7/dist-packages/flask/app.py", line 1292, in wsgi_app,
referer: http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]     response =
self.full_dispatch_request(), referer: http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]   File
"/usr/lib/python2.7/dist-packages/flask/app.py", line 1062, in
full_dispatch_request, referer: http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]     rv =
self.handle_user_exception(e), referer: http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]   File
"/usr/lib/python2.7/dist-packages/flask/app.py", line 1060, in
full_dispatch_request, referer: http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]     rv =
self.dispatch_request(), referer: http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]   File
"/usr/lib/python2.7/dist-packages/flask/app.py", line 1047, in
dispatch_request, referer: http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]     return
self.view_functions[rule.endpoint](**req.view_args), referer:
http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]   File "/srv/www/
myproject.com/myproject/__init__.py", line 40, in index, referer:
http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]     return
render_template('main.html', user=user, projects = projects ), referer:
http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]   File
"/usr/lib/python2.7/dist-packages/flask/templating.py", line 121, in
render_template, referer: http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]     context,
ctx.app), referer: http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]   File
"/usr/lib/python2.7/dist-packages/flask/templating.py", line 105, in
_render, referer: http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]     rv =
template.render(context), referer: http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]   File
"/usr/lib/python2.7/dist-packages/jinja2/environment.py", line 891, in
render, referer: http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]     return
self.environment.handle_exception(exc_info, True), referer:
http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]   File "/srv/www/
myproject.com/myproject/templates/main.html", line 1, in top-level template
code, referer: http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]     {% extends
"layout.html" %}, referer: http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]   File "/srv/www/
myproject.com/myproject/templates/layout.html", line 103, in top-level
template code, referer: http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]     {% block
body %}{% endblock %}, referer: http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]   File "/srv/www/
myproject.com/myproject/templates/main.html", line 34, in block "body",
referer: http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]     <a href="{{
url_for('viewproj', proj=project.project_name) }}">, referer:
http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]   File
"/usr/lib/python2.7/dist-packages/flask/helpers.py", line 195, in url_for,
referer: http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]     return
ctx.url_adapter.build(endpoint, values, force_external=external), referer:
http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]   File
"/usr/lib/pymodules/python2.7/werkzeug/routing.py", line 1409, in build,
referer: http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128]     raise
BuildError(endpoint, values, method), referer: http://myproject.com/
[Wed Jan 25 09:47:34 2012] [error] [client 199.58.143.128] BuildError:
('viewproj', {'proj': '12th'}, None), referer: http://myproject.com/

*Function:*

@app.route('/viewproj/<proj>', methods=['GET','POST'])
def viewproj(proj):
 ...

Template Excerpt:

{% for project in projects %}
  <li>
<a href="{{ url_for('viewproj', proj=project.project_name) }}">
{{project.project_name}}</a></li>
{% else %}
No projects
{% endfor %}

Hi,

Is the view defined in another file?  If that is the case make sure to 
import it at one point so that the decorators are registered.


Regards,
Armin

Thanks Armin. All my views are in the same file at the moment, so don't
think that's the issue

On Wed, Jan 25, 2012 at 10:50 AM, Armin Ronacher <
armin.ronacher@active-4.com> wrote:

> Hi,
>
> Is the view defined in another file?  If that is the case make sure to
> import it at one point so that the decorators are registered.
>
>
> Regards,
> Armin
>