Django FieldError only with debug disabled

Question

I've got a Django project that throws me "FieldError: Cannot resolve keyword 'game' into field. Choices are: [list of choices]".

The funny thing is, it only occurs when DEBUG is disabled in settings.py. When DEBUG is enabled everything seems to work fine.

I have identified the code that triggers the error. My model looks like this:

from django.db import models
from django.forms import ModelForm
from time import strftime
from rostermaker.models import Player
from django.core.exceptions import ValidationError
from django.utils import timezone

class Game(models.Model):
    when = models.DateTimeField(unique = True)
    opponent = models.CharField(max_length = 50, default="TBD")
...

    def __unicode__(self):
        when = timezone.localtime(self.DateTime)
        return when.strftime('%a, %b %d, %Y %I:%M %p')

class Stat(models.Model):
    g = models.ForeignKey(Game, related_name = 'stat_game')
    player = models.ForeignKey(Player, related_name = 'stat_player', limit_choices_to={'active': True})
... 

In admin.py, the .count and .filter lines trigger the error:

    def save_model(self, request, obj, form, change):
        obj.save()
        form.save_m2m()
        count = obj.players.count()
        women = obj.players.filter(sex='F')
        women_count = women.count()
        if count != 0:
            women_pct = int((women_count/float(count))*100)
            self.message_user(request,"Players scheduled: %s | Women: %s percent" % (count, women_pct))
        else:
            self.message_user(request,"Players scheduled: 0 | Women: 0 percent")

In a couple of views, lines similar to this one cause the error:

played_games_list = Game.objects.filter(DateTime__lte=timezone.now()).order_by('-when')

I'm using Django version 1.4 and PostgreSQL 8.4.20.

My best guess from what I've read here is that the Game class isn't loading properly. But why it appears to load properly when DEBUG is on mystifies me.

Any help is appreciated.

UPDATE: Traceback, as requested:

Traceback (most recent call last):

File "/home/bwareham/webapps/mprsb/lib/python2.7/django/core/handlers/base.py", line 111, in get_response response = callback(request, *callback_args, **callback_kwargs)

File "/home/bwareham/webapps/mprsb/lib/python2.7/django/contrib/admin/options.py", line 366, in wrapper return self.admin_site.admin_view(view)(*args, **kwargs)

File "/home/bwareham/webapps/mprsb/lib/python2.7/django/utils/decorators.py", line 91, in _wrapped_view response = view_func(request, *args, **kwargs)

File "/home/bwareham/webapps/mprsb/lib/python2.7/django/views/decorators/cache.py", line 89, in _wrapped_view_func response = view_func(request, *args, **kwargs)

File "/home/bwareham/webapps/mprsb/lib/python2.7/django/contrib/admin/sites.py", line 196, in inner return view(request, *args, **kwargs)

File "/home/bwareham/webapps/mprsb/lib/python2.7/django/utils/decorators.py", line 25, in _wrapper return bound_func(*args, **kwargs)

File "/home/bwareham/webapps/mprsb/lib/python2.7/django/utils/decorators.py", line 91, in _wrapped_view response = view_func(request, *args, **kwargs)

File "/home/bwareham/webapps/mprsb/lib/python2.7/django/utils/decorators.py", line 21, in bound_func return func(self, *args2, **kwargs2)

File "/home/bwareham/webapps/mprsb/lib/python2.7/django/db/transaction.py", line 224, in inner return func(*args, **kwargs)

File "/home/bwareham/webapps/mprsb/lib/python2.7/django/contrib/admin/options.py", line 955, in add_view self.save_model(request, new_object, form, False)

File "/home/bwareham/webapps/mprsb/myproject/rostermaker/admin.py", line 69, in save_model count = obj.players.count()

File "/home/bwareham/webapps/mprsb/lib/python2.7/django/db/models/manager.py", line 119, in count return self.get_query_set().count()

File "/home/bwareham/webapps/mprsb/lib/python2.7/django/db/models/fields/related.py", line 567, in get_query_set return super(ManyRelatedManager, self).get_query_set().using(db)._next_is_sticky().filter(**self.core_filters)

File "/home/bwareham/webapps/mprsb/lib/python2.7/django/db/models/query.py", line 624, in filter return self._filter_or_exclude(False, *args, **kwargs)

File "/home/bwareham/webapps/mprsb/lib/python2.7/django/db/models/query.py", line 642, in _filter_or_exclude clone.query.add_q(Q(*args, **kwargs))

File "/home/bwareham/webapps/mprsb/lib/python2.7/django/db/models/sql/query.py", line 1250, in add_q can_reuse=used_aliases, force_having=force_having)

File "/home/bwareham/webapps/mprsb/lib/python2.7/django/db/models/sql/query.py", line 1122, in add_filter process_extras=process_extras)

File "/home/bwareham/webapps/mprsb/lib/python2.7/django/db/models/sql/query.py", line 1316, in setup_joins "Choices are: %s" % (name, ", ".join(names)))

FieldError: Cannot resolve keyword 'game' into field. Choices are: Hall of Fame, active, alias, battingchamps, bombat, captains, firstName, goldengloves, id, lastName, mostimproved, mvp, photo, rookies, roster, sex, walker, whippet

Answer 1

It was some sort of loading problem. Found solution here.

Am able to force model loading with this snippet before the admin autodiscover function in urls.py:

from django.db.models.loading import cache as model_cache
if not model_cache.loaded:
    model_cache.get_models()

Thanks to all who tried to help me troubleshoot. I always learn something.