Django：clean_setting 中的无限循环

Question

我目前正在使用 Heroku CI 来运行我的 Django 测试： python3 manage.py test --fail-fast

但是，在 heroku CI 上运行这些时，当 django 系统尝试呈现设置时，我会得到一个无限循环：

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

  File "/app/.heroku/python/lib/python3.6/site-packages/django/core/handlers/exception.py", line 34, in inner

    response = get_response(request)

  File "/app/investorsuite/middleware.py", line 11, in middleware

    response = get_response(request)

  File "/app/.heroku/python/lib/python3.6/site-packages/django/core/handlers/exception.py", line 36, in inner

    response = response_for_exception(request, exc)

  File "/app/.heroku/python/lib/python3.6/site-packages/django/core/handlers/exception.py", line 95, in response_for_exception

    exc_info=sys.exc_info(),

  File "/app/.heroku/python/lib/python3.6/site-packages/django/utils/log.py", line 228, in log_response

    exc_info=exc_info,

  File "/app/.heroku/python/lib/python3.6/logging/__init__.py", line 1337, in error

    self._log(ERROR, msg, args, **kwargs)

  File "/app/.heroku/python/lib/python3.6/logging/__init__.py", line 1444, in _log

    self.handle(record)

  File "/app/.heroku/python/lib/python3.6/logging/__init__.py", line 1454, in handle

    self.callHandlers(record)

  File "/app/.heroku/python/lib/python3.6/logging/__init__.py", line 1516, in callHandlers

    hdlr.handle(record)

  File "/app/.heroku/python/lib/python3.6/logging/__init__.py", line 865, in handle

    self.emit(record)

  File "/app/.heroku/python/lib/python3.6/site-packages/django/utils/log.py", line 120, in emit

    message = "%s\n\n%s" % (self.format(no_exc_record), reporter.get_traceback_text())

  File "/app/.heroku/python/lib/python3.6/site-packages/django/views/debug.py", line 340, in get_traceback_text

    c = Context(self.get_traceback_data(), autoescape=False, use_l10n=False)

  File "/app/.heroku/python/lib/python3.6/site-packages/django/views/debug.py", line 306, in get_traceback_data

    'settings': get_safe_settings(),

  File "/app/.heroku/python/lib/python3.6/site-packages/django/views/debug.py", line 80, in get_safe_settings

    settings_dict[k] = cleanse_setting(k, getattr(settings, k))

  File "/app/.heroku/python/lib/python3.6/site-packages/django/views/debug.py", line 58, in cleanse_setting

    cleansed = {k: cleanse_setting(k, v) for k, v in value.items()}

  File "/app/.heroku/python/lib/python3.6/site-packages/django/views/debug.py", line 58, in <dictcomp>

    cleansed = {k: cleanse_setting(k, v) for k, v in value.items()}

  File "/app/.heroku/python/lib/python3.6/site-packages/django/views/debug.py", line 58, in cleanse_setting

    cleansed = {k: cleanse_setting(k, v) for k, v in value.items()}
.......

RecursionError: maximum recursion depth exceeded

我不确定这个错误背后的原因是什么。我一直在寻找可能有问题的字典（cleanse_setting 递归输入字典），但我似乎在我的设置文件中找不到任何字典：

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

  File "/app/.heroku/python/lib/python3.6/site-packages/django/core/handlers/exception.py", line 34, in inner

    response = get_response(request)

  File "/app/investorsuite/middleware.py", line 11, in middleware

    response = get_response(request)

  File "/app/.heroku/python/lib/python3.6/site-packages/django/core/handlers/exception.py", line 36, in inner

    response = response_for_exception(request, exc)

  File "/app/.heroku/python/lib/python3.6/site-packages/django/core/handlers/exception.py", line 95, in response_for_exception

    exc_info=sys.exc_info(),

  File "/app/.heroku/python/lib/python3.6/site-packages/django/utils/log.py", line 228, in log_response

    exc_info=exc_info,

  File "/app/.heroku/python/lib/python3.6/logging/__init__.py", line 1337, in error

    self._log(ERROR, msg, args, **kwargs)

  File "/app/.heroku/python/lib/python3.6/logging/__init__.py", line 1444, in _log

    self.handle(record)

  File "/app/.heroku/python/lib/python3.6/logging/__init__.py", line 1454, in handle

    self.callHandlers(record)

  File "/app/.heroku/python/lib/python3.6/logging/__init__.py", line 1516, in callHandlers

    hdlr.handle(record)

  File "/app/.heroku/python/lib/python3.6/logging/__init__.py", line 865, in handle

    self.emit(record)

  File "/app/.heroku/python/lib/python3.6/site-packages/django/utils/log.py", line 120, in emit

    message = "%s\n\n%s" % (self.format(no_exc_record), reporter.get_traceback_text())

  File "/app/.heroku/python/lib/python3.6/site-packages/django/views/debug.py", line 340, in get_traceback_text

    c = Context(self.get_traceback_data(), autoescape=False, use_l10n=False)

  File "/app/.heroku/python/lib/python3.6/site-packages/django/views/debug.py", line 306, in get_traceback_data

    'settings': get_safe_settings(),

  File "/app/.heroku/python/lib/python3.6/site-packages/django/views/debug.py", line 80, in get_safe_settings

    settings_dict[k] = cleanse_setting(k, getattr(settings, k))

  File "/app/.heroku/python/lib/python3.6/site-packages/django/views/debug.py", line 58, in cleanse_setting

    cleansed = {k: cleanse_setting(k, v) for k, v in value.items()}

  File "/app/.heroku/python/lib/python3.6/site-packages/django/views/debug.py", line 58, in <dictcomp>

    cleansed = {k: cleanse_setting(k, v) for k, v in value.items()}

  File "/app/.heroku/python/lib/python3.6/site-packages/django/views/debug.py", line 58, in cleanse_setting

    cleansed = {k: cleanse_setting(k, v) for k, v in value.items()}
.......

RecursionError: maximum recursion depth exceeded

利用 Django2.2.1 和 python 3.6.8

编辑：很明显，设置中的 DATABASE 值是由于某种原因由 heroku 递归定义的？：

>>> settings.DATABASES['default']['TEST']['TEST']
{'NAME': '*****', 'USER': '*****', 'PASSWORD': '*****', 'HOST': '******', 'PORT': 3306, 'CONN_MAX_AGE': 600, 'OPTIONS': {}, 'ENGINE': 'django.db.backends.mysql', 'TEST': {...}, 'init_command': "SET sql_mode='STRICT_TRANS_TABLES'", 'ATOMIC_REQUESTS': False, 'AUTOCOMMIT': True, 'TIME_ZONE': None, 'CHARSET': None, 'COLLATION': None, 'MIRROR': None}

这并没有真正让我感到困惑

EDIT2：我试过清理文件并测试不同的东西，感觉很迷茫。我真的不知道从这里去哪里。我应该在 django_heroku 的 git repo 上报告错误吗？可能只是我做错了什么，但我真的不知道该去哪里。我将尝试创建 django 应用程序的最小实现，并尝试在接下来的一天中重现该错误，最坏的情况。