AppRegistryNotReady: lazy format_html()? - django

Question

Why do I get this exception?
Traceback (most recent call last):
File "/path1/myapp-isu/myapp_isu/tests/unit/views/test_view_isu.py", line 8, in <module>
from myapp_isu.search_form import ISUSearchForm
File "/path1/myapp-isu/myapp_isu/search_form.py", line 87, in <module>
class ISUSearchForm(forms.Form):
File "/path1/myapp-isu/myapp_isu/search_form.py", line 108, in ISUSearchForm
foo_filter=forms.ModelChoiceField(FooFilter.objects.all(), label=format_html('%s', reverse_lazy('foo-filter'), FooFilter._meta.verbose_name))
File "/path1/dt/dt/utils/templateutils.py", line 127, in reverse
return urlresolvers.reverse(*args, **kwargs)
File "/path1/dt/dt/utils/urlresolverutils.py", line 49, in patched_reverse
base_url = orig_reverse(viewname, urlconf=urlconf, args=args, kwargs=kwargs, prefix=prefix, current_app=current_app)
File "/path2/django/core/urlresolvers.py", line 578, in reverse
return force_text(iri_to_uri(resolver._reverse_with_prefix(view, prefix, *args, **kwargs)))
File "/path2/django/core/urlresolvers.py", line 432, in _reverse_with_prefix
self._populate()
File "/path2/django/core/urlresolvers.py", line 284, in _populate
for pattern in reversed(self.url_patterns):
File "/path2/django/core/urlresolvers.py", line 401, in url_patterns
patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "/path2/django/core/urlresolvers.py", line 395, in urlconf_module
self._urlconf_module = import_module(self.urlconf_name)
File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
__import__(name)
File "/path1/myapp-eins/myapp_eins/etc/rooturls.py", line 13, in <module>
admin.autodiscover()
File "/path2/django/contrib/admin/__init__.py", line 24, in autodiscover
autodiscover_modules('admin', register_to=site)
File "/path2/django/utils/module_loading.py", line 67, in autodiscover_modules
for app_config in apps.get_app_configs():
File "/path2/django/apps/registry.py", line 137, in get_app_configs
self.check_apps_ready()
File "/path2/django/apps/registry.py", line 124, in check_apps_ready
raise AppRegistryNotReady("Apps aren't loaded yet.")
django.core.exceptions.AppRegistryNotReady: Apps aren't loaded yet.
It only happens if I call the unittest via PyCharm, not if I use py.test on the shell.
I guess reverse_lazy() is not lazy here, since it gets used in format_html(). Any way to have a lazy format_html()?
Versions:
Django 1.8
Pycharm 5.0.4

Answer 1

Since there are things like url_patterns in the stacktrace, I assume that DJANGO_SETTINGS_MODULE is set correctly .
But, you still need to call django.setup() before running anything else.
import django
django.setup()
For me, that made this error message go away.

Answer 2

I've had some trouble using PyCharm, myself, and I'll assume you're using the the community edition (which I've been using).
If so, the problem is very likely that you're not properly configured for django. You can probably fix this with some hacks that might work for this.
I'd start off with this.
(importing django to ensure the django console is run)
Then maybe this.
There's also this:
Check "Edit Configurations" under the test you're running, and add DJANGO_SETTINGS_MODULE=<app-name-here>.settings to environment variables.

Answer 3

If all of the above fails, try initializing your form and doing the import in the constructor:
class ISUSearchForm(...):
...
foo_filter = forms.Field()
...
def __init__(*args, **kwargs)
from ... import reverse_lazy
from ... import FooFilter
self.fields['foo_filter'] = \
forms.ModelChoiceField(
FooFilter.objects.all(),
label=format_html(
'%s',
reverse_lazy('foo-filter'),
FooFilter._meta.verbose_name
)
)
super().__init__(*args, **kwargs)
The error may be caused by the exact import sequence performed by the different test runners and the fact that you use only class variables to customize your form.

Answer 4

In django 1.8, reverse() and reverse_lazy() now return Unicode strings instead of byte strings.
Please refer the link:
https://docs.djangoproject.com/en/1.8/releases/1.8/