每当我尝试使用 Djongo 在 Django 中创建EmbeddedField时，我都会收到以下错误消息。 我尝试了网络上建议的所有内容。但我绝对被困在这里，需要帮助来克服这个问题。 一旦我尝试migrate或尝试runserver它就会引发此错误。一旦我使用EmbeddedField，此错误就开始出现。 我还没有修改 manage.py 文件。
错误信息
djongo django.core.expceptions.AppRegistryNotReady: Models aren't loaded yet.
models.py
from djongo import models
class ClientRepresentation(models.Model):
client_main_contact = models.CharField(max_length=100)
client_stand_in_contact = models.CharField(max_length=100)
class Meta:
abstract = True
class User(models.Model):
client_name = models.CharField(max_length=100)
client_location = models.CharField(max_length=100)
client_representation = models.EmbeddedField(
model_container=ClientRepresentation
# null=True
)
objects = models.DjongoManager()
def __str__(self):
return self.client_name
settings.py
INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
# REST Framework API
'rest_framework',
# Own Apps
'usr'
]
manage.py
#!/usr/bin/env python
"""Django's command-line utility for administrative tasks."""
import os
import sys
def main():
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'djongotest.settings')
try:
from django.core.management import execute_from_command_line
except ImportError as exc:
raise ImportError(
"Couldn't import Django. Are you sure it's installed and "
"available on your PYTHONPATH environment variable? Did you "
"forget to activate a virtual environment?"
) from exc
execute_from_command_line(sys.argv)
if __name__ == '__main__':
main()
这是 Djongo 1.3.2 版本中创建的问题。安装 1.3.1 或更低版本不会出现此问题。
您可以通过执行以下命令进行检查：pip install djongo<1.3.2并运行python manage.py check以查看是否发生错误。
引入此错误是因为 Djongo 1.3.2 中添加了一种新的验证方法，该方法验证模型容器，但无法在该时间点完成。这个问题可以在上游修复，因为问题是在构建反向关系树时引起的，这只有在所有反向模型都准备就绪的情况下才能完成。
由于它只是一个验证，你可以子类化EmbeddedField，只是不调用验证：
from djongo import models
class EmbeddedField(models.EmbeddedField):
def __init__(self, model_container, model_form_class=None, model_form_kwargs = None, *args, **kwargs):
self.model_container = model_container
self.model_form_class = model_form_class
self.model_form_kwargs = {} if model_form_kwargs is None else model_form_kwargs
# Bypass call to _validate_container()
super(models.fields.FormlessField, self).__init__(*args, **kwargs)
class User(models.Model):
...
client_representation = EmbeddedField(
model_container=ClientRepresentation
)