django rest api应用程序没有启动

Question

我在 django RESTful 框架上创建了一个 RESTful API，当我运行命令时突然 API 应用程序没有启动

 python manage.py runserver

这是完整的异常日志：

Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x7f778bc98f28>
Traceback (most recent call last):
  File "/home/developer/venv/lib/python3.6/site-packages/django/utils/autoreload.py", line 225, in wrapper
    fn(*args, **kwargs)
  File "/home/developer/venv/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 109, in inner_run
    autoreload.raise_last_exception()
  File "/home/developer/venv/lib/python3.6/site-packages/django/utils/autoreload.py", line 248, in raise_last_exception
    raise _exception[1]
  File "/home/developer/venv/lib/python3.6/site-packages/django/core/management/__init__.py", line 337, in execute
    autoreload.check_errors(django.setup)()
  File "/home/developer/venv/lib/python3.6/site-packages/django/utils/autoreload.py", line 225, in wrapper
    fn(*args, **kwargs)
  File "/home/developer/venv/lib/python3.6/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/home/developer/venv/lib/python3.6/site-packages/django/apps/registry.py", line 112, in populate
    app_config.import_models()
  File "/home/developer/venv/lib/python3.6/site-packages/django/apps/config.py", line 198, in import_models
    self.models_module = import_module(models_module_name)
  File "/home/developer/venv/lib/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/developer/note_api/main/models.py", line 21, in <module>
    Token.objects.get_or_create(user=user)
  File "/home/developer/venv/lib/python3.6/site-packages/django/db/models/manager.py", line 82, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/home/developer/venv/lib/python3.6/site-packages/django/db/models/query.py", line 486, in get_or_create
    return self.get(**lookup), False
  File "/home/developer/venv/lib/python3.6/site-packages/django/db/models/query.py", line 390, in get
    clone = self.filter(*args, **kwargs)
  File "/home/developer/venv/lib/python3.6/site-packages/django/db/models/query.py", line 844, in filter
    return self._filter_or_exclude(False, *args, **kwargs)
  File "/home/developer/venv/lib/python3.6/site-packages/django/db/models/query.py", line 862, in _filter_or_exclude
    clone.query.add_q(Q(*args, **kwargs))
  File "/home/developer/venv/lib/python3.6/site-packages/django/db/models/sql/query.py", line 1263, in add_q
    clause, _ = self._add_q(q_object, self.used_aliases)
  File "/home/developer/venv/lib/python3.6/site-packages/django/db/models/sql/query.py", line 1287, in _add_q
    split_subq=split_subq,
  File "/home/developer/venv/lib/python3.6/site-packages/django/db/models/sql/query.py", line 1164, in build_filter
    lookups, parts, reffed_expression = self.solve_lookup_type(arg)
  File "/home/developer/venv/lib/python3.6/site-packages/django/db/models/sql/query.py", line 1028, in solve_lookup_type
    _, field, _, lookup_parts = self.names_to_path(lookup_splitted, self.get_meta())
  File "/home/developer/venv/lib/python3.6/site-packages/django/db/models/sql/query.py", line 1365, in names_to_path
    if field.is_relation and not field.related_model:
  File "/home/developer/venv/lib/python3.6/site-packages/django/utils/functional.py", line 37, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/home/developer/venv/lib/python3.6/site-packages/django/db/models/fields/related.py", line 94, in related_model
    apps.check_models_ready()
  File "/home/developer/venv/lib/python3.6/site-packages/django/apps/registry.py", line 137, in check_models_ready
    raise AppRegistryNotReady("Models aren't loaded yet.")

我尝试过多次重启服务器，然后更改了 manage.py 脚本，但它没有帮助。

任何帮助将不胜感激。

Answer 1

删除您的虚拟环境并创建一个新环境，安装您的软件包，然后删除除 init 之外的所有迁移，删除您的数据库表（如果您没有重要的数据，如果不创建新数据库和使用它）并运行：

python manage.py migrate --fake <app name> zero

然后尝试再次进行迁移，然后迁移并运行服务器，如果问题解决，请告诉我