阅读StackOverflow和互联网上的所有主题 - 没有运气。
# admindivisions.models
class Countries(models.Model):
osm_id = models.IntegerField(db_index=True, null=True)
status = models.IntegerField()
population = models.IntegerField(null=True)
iso3166_1 = models.CharField(max_length=2, blank=True)
iso3166_1_a2 = models.CharField(max_length=2, blank=True)
iso3166_1_a3 = models.CharField(max_length=3, blank=True)
class Meta:
db_table = 'admindivisions_countries'
verbose_name = 'Country'
verbose_name_plural = 'Countries'
class CountriesTranslations(models.Model):
common_name = models.CharField(max_length=81, blank=True, db_index=True)
formal_name = models.CharField(max_length=100, blank=True)
country = models.ForeignKey(Countries, on_delete=models.CASCADE, verbose_name='Details of Country')
lang_group = models.ForeignKey(LanguagesGroups, on_delete=models.CASCADE, verbose_name='Language of Country',
null=True)
class Meta:
db_table = 'admindivisions_countries_translations'
verbose_name = 'Country Translation'
verbose_name_plural = 'Countries Translations'
# profiles.models
from admindivisions.models import CountriesTranslations, Countries
class AbstractProfile(models.Model):
COUNTRY_CHOICES = ()
if (Languages.objects.model._meta.db_table in connection.introspection.table_names()):
# Just for test - This executes without any errors
CountriesTranslations.objects.filter(common_name="USA")
for country in Countries.objects.filter(status=1).exclude(iso3166_1='', iso3166_1_a2=''):
# Just for test - Also executes ok
CountriesTranslations.objects.get(common_name="USA")
# Makes problem (seems to be because of FK)
country_name = CountriesTranslations.objects.get(country=country)
COUNTRY_CHOICES += ((country.id, country_name),)
country = models.ForeignKey(Countries, verbose_name=_('country'), choices=COUNTRY_CHOICES, blank=True)
title = models.CharField(_('title'), max_length=30)
info = models.TextField(_('information'), max_length=500, blank=True)
class Meta:
abstract = True
回溯：
Traceback (most recent call last):
File "./manage.py", line 22, in <module>
execute_from_command_line(sys.argv)
File "/home/antonio/www/sportland/lib/python3.5/site-packages/django/core/management/__init__.py", line 367, in execute_from_command_line
utility.execute()
File "/home/antonio/www/sportland/lib/python3.5/site-packages/django/core/management/__init__.py", line 341, in execute
django.setup()
File "/home/antonio/www/sportland/lib/python3.5/site-packages/django/__init__.py", line 27, in setup
apps.populate(settings.INSTALLED_APPS)
File "/home/antonio/www/sportland/lib/python3.5/site-packages/django/apps/registry.py", line 108, in populate
app_config.import_models(all_models)
File "/home/antonio/www/sportland/lib/python3.5/site-packages/django/apps/config.py", line 199, in import_models
self.models_module = import_module(models_module_name)
File "/usr/lib/python3.5/importlib/__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 986, in _gcd_import
File "<frozen importlib._bootstrap>", line 969, in _find_and_load
File "<frozen importlib._bootstrap>", line 958, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 673, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 665, in exec_module
File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed
File "/home/antonio/www/sportland/sportland/src/profiles/models.py", line 76, in <module>
class AbstractProfile(models.Model):
File "/home/antonio/www/sportland/sportland/src/profiles/models.py", line 109, in AbstractProfile
country_name = CountriesTranslations.objects.get(country=country)
File "/home/antonio/www/sportland/lib/python3.5/site-packages/django/db/models/manager.py", line 85, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "/home/antonio/www/sportland/lib/python3.5/site-packages/django/db/models/query.py", line 376, in get
clone = self.filter(*args, **kwargs)
File "/home/antonio/www/sportland/lib/python3.5/site-packages/django/db/models/query.py", line 796, in filter
return self._filter_or_exclude(False, *args, **kwargs)
File "/home/antonio/www/sportland/lib/python3.5/site-packages/django/db/models/query.py", line 814, in _filter_or_exclude
clone.query.add_q(Q(*args, **kwargs))
File "/home/antonio/www/sportland/lib/python3.5/site-packages/django/db/models/sql/query.py", line 1227, in add_q
clause, _ = self._add_q(q_object, self.used_aliases)
File "/home/antonio/www/sportland/lib/python3.5/site-packages/django/db/models/sql/query.py", line 1253, in _add_q
allow_joins=allow_joins, split_subq=split_subq,
File "/home/antonio/www/sportland/lib/python3.5/site-packages/django/db/models/sql/query.py", line 1133, in build_filter
lookups, parts, reffed_expression = self.solve_lookup_type(arg)
File "/home/antonio/www/sportland/lib/python3.5/site-packages/django/db/models/sql/query.py", line 1019, in solve_lookup_type
_, field, _, lookup_parts = self.names_to_path(lookup_splitted, self.get_meta())
File "/home/antonio/www/sportland/lib/python3.5/site-packages/django/db/models/sql/query.py", line 1308, in names_to_path
if field.is_relation and not field.related_model:
File "/home/antonio/www/sportland/lib/python3.5/site-packages/django/utils/functional.py", line 35, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/home/antonio/www/sportland/lib/python3.5/site-packages/django/db/models/fields/related.py", line 111, in related_model
apps.check_models_ready()
File "/home/antonio/www/sportland/lib/python3.5/site-packages/django/apps/registry.py", line 131, in check_models_ready
raise AppRegistryNotReady("Models aren't loaded yet.")
django.core.exceptions.AppRegistryNotReady: Models aren't loaded yet.
如果我想执行任何manage.py命令，就会发生这种情况。
从上面的几个测试中我可以猜到问题是由于ForeignKey。如何解决？
Django 1.10
答案 0 :(得分：0)
你不能在班级做任何类似的逻辑。显然，在模型完全加载之前，您无法查询模型。
我不明白你在那里做什么，但是你应该把它变成一种方法。