我最近将一个项目从1.8.11升级到1.9，一切在1.8上都可以正常工作，并且我已经通过了弃用警告并清理了项目中的许多内容。
当我尝试运行项目时出现错误
ValueError: Cannot create form field for 'country' yet, because its related model 'Country' has not been
loaded yet
我已经尝试解决了几个小时，非常感谢您的帮助
我浏览了Django网站上的升级说明，升级了一些依赖项，这些依赖项修复了一个或两个警告，但仍未解决问题。
User = settings.AUTH_USER_MODEL
class Country(TimeStampedModel):
name = models.CharField(max_length=50, unique=True)
code = models.CharField(max_length=2, null=True, blank=True, db_index=True)
code3 = models.CharField(max_length=3, null=True, blank=True, unique=True)
last_updated_by = models.ForeignKey(User, null=True, blank=True, related_name='%(class)s_last_updated_by')
created_by = models.ForeignKey(User, default=settings.SYSTEM_USER_ID, related_name='%(class)s_created_by')
objects = models.Manager()
countries = CountryManager()
class Meta:
verbose_name = _('country')
verbose_name_plural = _('countries')
ordering = ['name']
def __str__(self):
return self.name
class AddressAbstractModel(TimeStampedModel):
country = models.ForeignKey('Country', verbose_name=_('country'), null=True, blank=True)
address_1 = models.CharField(_('street address line 1'), max_length=50, blank=True)
address_2 = models.CharField(_('street address line 2'), max_length=50, blank=True)
city = models.CharField(_('city'), max_length=50, blank=True)
postal_code = models.CharField(_('postal code'), max_length=20, blank=True)
latitude = models.DecimalField(_('Latitude'), max_digits=9, decimal_places=6, null=True, blank=True)
longitude = models.DecimalField(_('Longitude'), max_digits=9, decimal_places=6, null=True, blank=True)
class Meta:
abstract = True
表格
User = get_user_model()
class UserChangeForm(forms.UserChangeForm):
class Meta:
model = User
fields = '__all__'
help_texts = {
'username': _('Required. Letters, digits and @/./+/-/_ only.')
}
class UserCreationForm(forms.UserCreationForm):
class Meta:
model = User
fields = ("username",)
help_texts = {
'username': _('Required. Letters, digits and @/./+/-/_ only.')
}
编辑：请求完全回溯
web_1_1b9067fcd9a4 | Traceback (most recent call last):
web_1_1b9067fcd9a4 | File "manage.py", line 10, in <module>
web_1_1b9067fcd9a4 | execute_from_command_line(sys.argv)
web_1_1b9067fcd9a4 | File "/usr/local/lib/python3.6/dist-packages/django/core/management/__init__.py", line 350, in execute_
from_command_line
web_1_1b9067fcd9a4 | utility.execute()
web_1_1b9067fcd9a4 | File "/usr/local/lib/python3.6/dist-packages/django/core/management/__init__.py", line 324, in execute
web_1_1b9067fcd9a4 | django.setup()
web_1_1b9067fcd9a4 | File "/usr/local/lib/python3.6/dist-packages/django/__init__.py", line 18, in setup
web_1_1b9067fcd9a4 | apps.populate(settings.INSTALLED_APPS)
web_1_1b9067fcd9a4 | File "/usr/local/lib/python3.6/dist-packages/django/apps/registry.py", line 115, in populate
web_1_1b9067fcd9a4 | app_config.ready()
web_1_1b9067fcd9a4 | File "/usr/local/lib/python3.6/dist-packages/django/contrib/admin/apps.py", line 22, in ready
web_1_1b9067fcd9a4 | self.module.autodiscover()
web_1_1b9067fcd9a4 | File "/usr/local/lib/python3.6/dist-packages/django/contrib/admin/__init__.py", line 26, in autodiscove
r
web_1_1b9067fcd9a4 | autodiscover_modules('admin', register_to=site)
web_1_1b9067fcd9a4 | File "/usr/local/lib/python3.6/dist-packages/django/utils/module_loading.py", line 50, in autodiscover_
modules
web_1_1b9067fcd9a4 | import_module('%s.%s' % (app_config.name, module_to_search))
web_1_1b9067fcd9a4 | File "/usr/lib/python3.6/importlib/__init__.py", line 126, in import_module
web_1_1b9067fcd9a4 | return _bootstrap._gcd_import(name[level:], package, level)
web_1_1b9067fcd9a4 | File "<frozen importlib._bootstrap>", line 994, in _gcd_import
web_1_1b9067fcd9a4 | File "<frozen importlib._bootstrap>", line 971, in _find_and_load
web_1_1b9067fcd9a4 | File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
web_1_1b9067fcd9a4 | File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
web_1_1b9067fcd9a4 | File "<frozen importlib._bootstrap_external>", line 678, in exec_module
web_1_1b9067fcd9a4 | File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
web_1_1b9067fcd9a4 | File "winda/users/admin.py", line 11, in <module>
web_1_1b9067fcd9a4 | from .forms import UserChangeForm, UserCreationForm
web_1_1b9067fcd9a4 | File "winda/users/forms.py", line 5, in <module>
web_1_1b9067fcd9a4 | class UserChangeForm(forms.UserChangeForm):
web_1_1b9067fcd9a4 | File "/usr/local/lib/python3.6/dist-packages/django/forms/models.py", line 247, in __new__
web_1_1b9067fcd9a4 | opts.field_classes)
web_1_1b9067fcd9a4 | File "/usr/local/lib/python3.6/dist-packages/django/forms/models.py", line 172, in fields_for_model
web_1_1b9067fcd9a4 | formfield = f.formfield(**kwargs)
web_1_1b9067fcd9a4 | File "/usr/local/lib/python3.6/dist-packages/django/db/models/fields/related.py", line 937, in formfiel
d
web_1_1b9067fcd9a4 | (self.name, self.remote_field.model))
web_1_1b9067fcd9a4 | ValueError: Cannot create form field for 'country' yet, because its related model 'Country' has not been
loaded yet
已安装的应用程序
DJANGO_APPS = (
# Default Django apps:
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.sites',
'django.contrib.messages',
'django.contrib.staticfiles',
# Useful template tags:
# 'django.contrib.humanize',
# Admin
'django.contrib.admin',
'django.contrib.flatpages',
)
THIRD_PARTY_APPS = (
'widget_tweaks',
'storages',
'reversion',
'django_ses',
'timezone_field',
'ckeditor',
'ckeditor_uploader',
'rest_framework',
'rest_framework.authtoken',
'solo',
'phonenumber_field',
'allauth',
)
# Apps specific for this project go here.
LOCAL_APPS = (
# Your stuff: custom apps go here
'core',
'users',
'common',
'registration',
'trainings',
'courses',
'delegate',
'organization',
'database_admin',
'database_super_admin',
'orders',
'api',
)
用户模式
class User(AbstractBaseUser, PermissionsMixin, UserProfileAbstract):
UNKNOWN, BOUNCE, COMPLAINT, DELIVERY = 'Unknown', 'Bounce', 'Complaint', 'Delivery'
EMAIL_STATUS_CHOICE = (
(UNKNOWN, 'Unknown'),
(BOUNCE, 'Bounce'),
(COMPLAINT, 'Complaint'),
(DELIVERY, 'Delivery')
)
delegate_id = models.CharField(_('delegate id'), unique=True, max_length=12, null=True, default=None, db_index=True)
expires_at = models.DateTimeField(_('expires at'), default=TimeStampedModel.user_expires_at_default)
email_status = models.CharField(_('email status'), max_length=10, choices=EMAIL_STATUS_CHOICE)
role = models.CharField(_('role'), max_length=30, choices=UserProfileAbstract.ROLE_CHOICE, db_index=True)
company_name = models.CharField(_('company name'), max_length=50, blank=True)
last_updated_by = models.ForeignKey('self', default=settings.SYSTEM_USER_ID, null=True, related_name='%(class)s_last_updated_by')
created_by = models.ForeignKey('self', default=settings.SYSTEM_USER_ID, null=True, related_name='%(class)s_created_by')
archived_by = models.ForeignKey('self', null=True, related_name='%(class)s_archived_by', blank=True)
can_upload = models.BooleanField(_('can upload files'), default=False)
can_buy_credit = models.BooleanField(_('can buy credits'), default=False)
can_use_credit = models.BooleanField(_('can use credits'), default=False)
can_ask_revoke = models.BooleanField(_('can ask to request certificate revokes'), default=False)
is_tp_site_access = models.BooleanField(_('Access to all TP site profiles'), default=False)
api_rate_limit = models.IntegerField(_('daily API request limit'), default=settings.API_CALL_RATE_LIMIT, blank=True)
is_api_enabled = models.BooleanField(_('API enabled'), default=False, blank=True)
username = models.CharField(_('username'), max_length=255, unique=True,
help_text=_('Required. 255 characters or fewer. Letters, digits and '
'@/./+/-/_ only.'),
validators=[
validators.RegexValidator(r'^[\w.@+-]+$',
_('Enter a valid username. '
'This value may contain only letters, numbers '
'and @/./+/-/_ characters.'), 'invalid'),
],
error_messages={
'unique': _("A user with that username already exists."),
})
first_name = models.CharField(_('first name(s)'), max_length=100, blank=False)
last_name = models.CharField(_('surname'), max_length=100, blank=False)
email = models.EmailField(_('email address'), blank=False, max_length=255)
is_staff = models.BooleanField(_('staff status'), default=False,
help_text=_('Designates whether the user can log into this admin '
'site.'))
is_active = models.BooleanField(_('active'), default=True,
help_text=_('Designates whether this user should be treated as '
'active. Unselect this instead of deleting accounts.'))
date_joined = models.DateTimeField(_('date joined'), default=timezone.now)
objects = WindaUserManager()
USERNAME_FIELD = 'username'
REQUIRED_FIELDS = ['email']
class Meta:
verbose_name = _('user')
verbose_name_plural = _('users')
def __str__(self):
return self.username
class UserProfileAbstract(AddressAbstractModel):
archived_from = models.DateTimeField(_('archived from'), default=TimeStampedModel.archived_from_default)
archived_at = models.DateTimeField(_('archived at'), null=True, blank=True)
job_title = models.CharField(_('job title'), max_length=50, blank=True)
organization_name = models.CharField(_('organisation name'), max_length=200, blank=True)
training_provider = models.ForeignKey(TrainingProvider, verbose_name=_('training provider'), null=True, blank=True,
related_name='%(class)s_users')
phone = models.CharField(_('work phone number'), max_length=15, blank=True)
timezone = TimeZoneField(default='Europe/London')
class Meta:
abstract = True
答案 0 :(得分：1)
您遇到了问题#25858。当AddressAbstractModel模型使用users.User时，'Country'解析为users.Country，它不存在。
您可以通过在抽象模型的外键中使用common.Country来解决问题。
有关更多信息，请参见foreign key docs中的示例。