python - Django admin.site.register 为模型类抛出 TypeError

Question

这是 this 的后续问题问题。

我想自动从 django models.py 文件导入类，然后用 admin.site.register() 注册每个类。这是我的代码:

from django.contrib import admin
import inspect
from . import models 

for name, obj in inspect.getmembers(models):
    if inspect.isclass(obj):
        admin.site.register(obj)

这段代码抛出一个TypeError: 'type' object is not iterable。

OP 将此问题标记为已回答，我发现了其他几个显示此代码的示例。我还查看了文档 here并且没有看到任何表明这是错误的东西。

完整回溯:

Bills-MacBook-Pro:Pro billarmstrong$ python manage.py runserver/anaconda3/lib/python3.6/site-packages/django/db/models/base.py:309:RuntimeWarning: Model 'ProWP.p_item' was already registered. Reloading models is not advised as it can lead to inconsistencies, most notably with related models.  new_class._meta.apps.register_model(new_class._meta.app_label, new_class)/anaconda3/lib/python3.6/site-packages/django/db/models/base.py:309:RuntimeWarning: Model 'ProWP.p_item' was already registered. Reloading models is not advised as it can lead to inconsistencies, most notably with related models.
  new_class._meta.apps.register_model(new_class._meta.app_label, new_class)
Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x108f1dea0>
Traceback (most recent call last):
  File "/anaconda3/lib/python3.6/site-packages/django/utils/autoreload.py", line 225, in wrapper
    fn(*args, **kwargs)
  File "/anaconda3/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 112, in inner_run
    autoreload.raise_last_exception()
  File "/anaconda3/lib/python3.6/site-packages/django/utils/autoreload.py", line 248, in raise_last_exception
    raise _exception[1]
  File "/anaconda3/lib/python3.6/site-packages/django/core/management/__init__.py", line 327, in execute
    autoreload.check_errors(django.setup)()
  File "/anaconda3/lib/python3.6/site-packages/django/utils/autoreload.py", line 225, in wrapper
    fn(*args, **kwargs)
  File "/anaconda3/lib/python3.6/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/anaconda3/lib/python3.6/site-packages/django/apps/registry.py", line 120, in populate
    app_config.ready()
  File "/anaconda3/lib/python3.6/site-packages/django/contrib/admin/apps.py", line 23, in ready
    self.module.autodiscover()
  File "/anaconda3/lib/python3.6/site-packages/django/contrib/admin/__init__.py", line 26, in autodiscover
    autodiscover_modules('admin', register_to=site)
  File "/anaconda3/lib/python3.6/site-packages/django/utils/module_loading.py", line 47, in autodiscover_modules
    import_module('%s.%s' % (app_config.name, module_to_search))
  File "/anaconda3/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 "/Users/billarmstrong/Documents/GitHub/Core/WebDataCollect/Pro/ProWP/admin.py", line 7, in <module>
    admin.site.register(obj)
  File "/anaconda3/lib/python3.6/site-packages/django/contrib/admin/sites.py", line 102, in register
    for model in model_or_iterable:
TypeError: 'type' object is not iterable

第二次 runserver 后出现新警告 - 但这不是原始错误的一部分。我包括了所有内容以供引用。 p_item 是 models.py

中的类对象

最终编辑

上面提到的警告是草率剪切/粘贴复制类的结果。它与原始问题或以下答案无关。

Answer 1

据推测，不仅导入了 django.db.models.Model 类。您的本地 models 模块可能包含更多项目，包括其他类(这使得 if inspect.isclass 通过)。您可能需要执行额外的 issubclass(obj, django.models.Model) 或类似检查。

它在链接问题中起作用的事实表明您在本地 models.py 模块中有额外的代码，可能是通过导入(很难注意到)。但是额外检查一下 obj 是否是一个实际的 Django 模型(如上所述)，可能比尝试删除那些额外代码更安全。

总而言之，请尝试以下(未经测试):

from django.contrib import admin
from django.db.models import Model
import inspect
from . import models 

for name, obj in inspect.getmembers(models):
    if inspect.isclass(obj) and issubclass(obj, Model):
        admin.site.register(obj)