我遵循的是官方Django文档中的第一个应用程序教程，尝试保存通过管理页面进行的某些更改时出现此错误。我对此进行了一些研究，但是我能够找到的可能解决方案（例如迁移数据库）根本行不通。如果您想查看我的代码的某些特定部分，请告诉我。

以下是错误：

OperationalError at /admin/polls/question/1/change/ no such table: main.auth_user__old Request Method: POST Request URL: http://127.0.0.1:8000/admin/polls/question/1/change/ Django Version: 2.1.4 Exception Type: OperationalError Exception Value: no such table: main.auth_user__old Exception Location: /Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/db/backends/sqlite3/base.py in execute, line 296 Python Executable: /Users/gfioravante/Projects/test_app/ta_env/bin/python3 Python Version: 3.7.1 Python Path:
['/Users/gfioravante/Projects/test_app/test_app', '/usr/local/Cellar/python/3.7.1/Frameworks/Python.framework/Versions/3.7/lib/python37.zip', '/usr/local/Cellar/python/3.7.1/Frameworks/Python.framework/Versions/3.7/lib/python3.7', '/usr/local/Cellar/python/3.7.1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/lib-dynload', '/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages'] Server time: Wed, 5 Dec 2018 16:45:00 +0000

and the traceback:

Environment:

Request Method: POST Request URL: http://127.0.0.1:8000/admin/polls/question/1/change/

Django Version: 2.1.4 Python Version: 3.7.1 Installed Applications: ['polls.apps.PollsConfig', 'django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.messages', 'django.contrib.staticfiles'] Installed Middleware: ['django.middleware.security.SecurityMiddleware', 'django.contrib.sessions.middleware.SessionMiddleware', 'django.middleware.common.CommonMiddleware', 'django.middleware.csrf.CsrfViewMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', 'django.contrib.messages.middleware.MessageMiddleware', 'django.middleware.clickjacking.XFrameOptionsMiddleware']

Traceback:

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/db/backends/utils.py" in _execute 85. return self.cursor.execute(sql, params)

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/db/backends/sqlite3/base.py" in execute 296. return Database.Cursor.execute(self, query, params)

The above exception (no such table: main.auth_user__old) was the direct cause of the following exception:

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/core/handlers/exception.py" in inner 34. response = get_response(request)

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/core/handlers/base.py" in _get_response 126. response = self.process_exception_by_middleware(e, request)

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/core/handlers/base.py" in _get_response 124. response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/contrib/admin/options.py" in wrapper 604. return self.admin_site.admin_view(view)(*args, **kwargs)

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/utils/decorators.py" in _wrapped_view 142. response = view_func(request, *args, **kwargs)

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/views/decorators/cache.py" in _wrapped_view_func 44. response = view_func(request, *args, **kwargs)

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/contrib/admin/sites.py" in inner 223. return view(request, *args, **kwargs)

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/contrib/admin/options.py" in change_view 1640. return self.changeform_view(request, object_id, form_url, extra_context)

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/utils/decorators.py" in _wrapper 45. return bound_method(*args, **kwargs)

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/utils/decorators.py" in _wrapped_view 142. response = view_func(request, *args, **kwargs)

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/contrib/admin/options.py" in changeform_view 1525. return self._changeform_view(request, object_id, form_url, extra_context)

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/contrib/admin/options.py" in _changeform_view 1571. self.log_change(request, new_object, change_message)

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/contrib/admin/options.py" in log_change 826. change_message=message,

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/contrib/admin/models.py" in log_action 35. change_message=change_message,

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/db/models/manager.py" in manager_method 82. return getattr(self.get_queryset(), name)(*args, **kwargs)

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/db/models/query.py" in create 413. obj.save(force_insert=True, using=self.db)

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/db/models/base.py" in save 718. force_update=force_update, update_fields=update_fields)

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/db/models/base.py" in save_base 748. updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/db/models/base.py" in _save_table 831. result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/db/models/base.py" in _do_insert 869. using=using, raw=raw)

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/db/models/manager.py" in manager_method 82. return getattr(self.get_queryset(), name)(*args, **kwargs)

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/db/models/query.py" in _insert 1136. return query.get_compiler(using=using).execute_sql(return_id)

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/db/models/sql/compiler.py" in execute_sql 1289. cursor.execute(sql, params)

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/db/backends/utils.py" in execute 100. return super().execute(sql, params)

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/db/backends/utils.py" in execute 68. return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/db/backends/utils.py" in _execute_with_wrappers 77. return executor(sql, params, many, context)

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/db/backends/utils.py" in _execute 85. return self.cursor.execute(sql, params)

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/db/utils.py" in exit 89. raise dj_exc_value.with_traceback(traceback) from exc_value

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/db/backends/utils.py" in _execute 85. return self.cursor.execute(sql, params)

File "/Users/gfioravante/Projects/test_app/ta_env/lib/python3.7/site-packages/django/db/backends/sqlite3/base.py" in execute 296. return Database.Cursor.execute(self, query, params)

Exception Type: OperationalError at /admin/polls/question/1/change/ Exception Value: no such table: main.auth_user__old