Question

I’m getting the following error when trying to render a template:

NoReverseMatch at /things/
Reverse for 'edit_things' with arguments '(u'<function generate at 0x10a970aa',)' and     
keyword arguments '{}' not found.

In my template, the following works:

<a href="{% url add_thing %}" class="btn_plus">

But then I get an error here:

<td onclick="document.location = '{% url edit_thing thing.guid %}';" class="edit" id="edit_thing_{{ forloop.counter }}">&nbsp;&nbsp;&nbsp;</td>

We’re not using:
{% load url from future %}. This is Django 1.4.

In my urls:

url(r'^edit_thing/(?P<thing_id>[\w_-]{1,32})/$', 'edit_thing', name='edit_thing'),

And the view looks like:

def edit_thing(request, thing_id):

Any ideas on what is going wrong? I can’t understand why add_things works fine in the template, and it crashes as soon as it gets to edit_thing. Could it be that edit_thing takes an argument? I’ve tried everything on Stackoverflow, and have tried every combination of things (including load url from future, and so forth).

Here’s my model:

class Thing(models.Model):
  guid = models.CharField(max_length=Guid.LENGTH, blank=True, null=True, unique=True, default=Guid.generate)

  class Meta:
  app_label = 'things'

Answer 1

You need to change your model definition. Change the default:

class Thing(models.Model):
  guid = models.CharField(max_length=Guid.LENGTH, blank=True, null=True, unique=True, default=Guid.generate())

  class Meta:
      app_label = 'things'

You are getting a string representation of a function because you were passing the function itself:

'(u'<function generate at 0x10a970aa',)'

In other words:

>>> unicode(Guid.generate)
u'<function generate at 0x10a970aa'
>>> unicode(Guid.generate()) # This is what you need
u'Result'

That should do it