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

Question

Caught an exception while rendering:
Reverse for 'products.views.'filter_by_led' with arguments '()' and keyword arguments '{}' not found.

I was able to successfully import products.views.filter_by_led from the shell and it worked so the path should be correct.

Here is the urls.py:
(r'^led-tv/$', filter_by_led ),

This is where the error is being generated:
href="{% url products.views.filter_by_led %}">

Which I can't understand because this works fine from the same file:
{% url products.views.lcd_screen_size screen_size=50 %}

Here is the function definition:
def filter_by_led(request):

I don't understand why Django would think that the function would not be able to find the Reverse for that function.

I deleted all the *.pyc files and restarted Apache.

What am I doing wrong?

Answer 1

There are 3 things I can think of off the top of my head:

1. Just used named urls, it's more robust and maintainable anyway

2. Try using django.core.urlresolvers.reverse at the command line for a (possibly) better error

   >>> from django.core.urlresolvers import reverse
   >>> reverse('products.views.filter_by_led')
   

3. Check to see if you have more than one url that points to that view

Answer 2

I don't think you need the trailing slash in the URL entry. Ie, put this instead:

(r'^led-tv$', filter_by_led ),

This is assuming you have trailing slashes enabled, which is the default.