URL conf is evaluated after form Metas

[reames@…]

I have a model form that looks something like:

class MyForm(forms.ModelForm):
  class Meta(object):
    model = Foo
    my_data = urlresolvers.reverse('myview')

This causes the following error:

Exception Type: ImproperlyConfigured

Exception Value: The included urlconf project.urls doesn't have any patterns in it

I believe this is probably because forms are evaluated before the URL resolvers are.

[Alex Gaynor]

This is a natural artifact of how Python's module and import systems work. As a result, in 1.4 we introduced reverse_lazy, which works in these circumstances: ​https://docs.djangoproject.com/en/dev/topics/http/urls/#reverse-lazy