背后故事：
我正在创建一个测验应用程序。我首先想通过 Django 包将 Django (v=2.1.4) 与 Mongo 一起使用。一切正常，直到它没有，所以我决定完全放弃 Django 和 mongo 并回到 SQLite。我只在它相关的情况下提及它，但我不认为它是相关的。
我制作了该项目的副本，然后删除了原始项目。然后，我创建了一个具有相同名称和所有相同应用程序的新项目。这创建了一堆带有空白文件的新文件夹。我将原始副本移至这些文件夹（迁移文件除外）并替换了具有相同名称的空白文件。
我将mysite/settings.py文件改回默认读取：
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.sqlite3',
'NAME': os.path.join(BASE_DIR, 'hoquidb'),
}
}
据我所知，这会创建一个新项目，为它的初始迁移做好准备，它将使用 sqlite3。
问题：
所以我尝试进行初始迁移并收到一条神秘的错误消息：
(base) C:[redacted]\testabode\Hoqui\hoqui>python manage.py migrate
Traceback (most recent call last):
File "C:[redacted]\lib\site-packages\django\db\backends\utils.py", line 85, in _execute
return self.cursor.execute(sql, params)
File "C:[redacted]\lib\site-packages\django\db\backends\sqlite3\base.py", line 296, in execute
return Database.Cursor.execute(self, query, params)
sqlite3.OperationalError: no such table: realestate_sentence_beginning
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "manage.py", line 15, in <module>
execute_from_command_line(sys.argv)
File "C:[redacted]\lib\site-packages\django\core\management\__init__.py", line 381, in execute_from_command_line
utility.execute()
File "C:[redacted]\lib\site-packages\django\core\management\__init__.py", line 375, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "C:[redacted]\lib\site-packages\django\core\management\base.py", line 316, in run_from_argv
self.execute(*args, **cmd_options)
File "C:[redacted]\lib\site-packages\django\core\management\base.py", line 350, in execute
self.check()
File "C:[redacted]\lib\site-packages\django\core\management\base.py", line 379, in check
include_deployment_checks=include_deployment_checks,
File "C:[redacted]\lib\site-packages\django\core\management\commands\migrate.py", line 60, in _run_checks
issues.extend(super()._run_checks(**kwargs))
File "C:[redacted]\lib\site-packages\django\core\management\base.py", line 366, in _run_checks
return checks.run_checks(**kwargs)
File "C:[redacted]\lib\site-packages\django\core\checks\registry.py", line 71, in run_checks
new_errors = check(app_configs=app_configs)
File "C:[redacted]\lib\site-packages\django\core\checks\urls.py", line 13, in check_url_config
return check_resolver(resolver)
File "C:[redacted]\lib\site-packages\django\core\checks\urls.py", line 23, in check_resolver
return check_method()
File "C:[redacted]\lib\site-packages\django\urls\resolvers.py", line 396, in check
for pattern in self.url_patterns:
File "C:[redacted]\lib\site-packages\django\utils\functional.py", line 37, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "C:[redacted]\lib\site-packages\django\urls\resolvers.py", line 533, in url_patterns
patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "C:[redacted]\lib\site-packages\django\utils\functional.py", line 37, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "C:[redacted]\lib\site-packages\django\urls\resolvers.py", line 526, in urlconf_module
return import_module(self.urlconf_name)
File "C:[redacted]\lib\importlib\__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 978, in _gcd_import
File "<frozen importlib._bootstrap>", line 961, in _find_and_load
File "<frozen importlib._bootstrap>", line 950, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 655, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 678, in exec_module
File "<frozen importlib._bootstrap>", line 205, in _call_with_frames_removed
File "C:[redacted]\testabode\Hoqui\hoqui\hoqui\urls.py", line 24, in <module>
path('quiz_taker/', include('quiz_taker.urls')),
File "C:[redacted]\lib\site-packages\django\urls\conf.py", line 34, in include
urlconf_module = import_module(urlconf_module)
File "C:[redacted]\lib\importlib\__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 978, in _gcd_import
File "<frozen importlib._bootstrap>", line 961, in _find_and_load
File "<frozen importlib._bootstrap>", line 950, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 655, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 678, in exec_module
File "<frozen importlib._bootstrap>", line 205, in _call_with_frames_removed
File "C:[redacted]\testabode\Hoqui\hoqui\quiz_taker\urls.py", line 3, in <module>
from . import views
File "C:[redacted]\testabode\Hoqui\hoqui\quiz_taker\views.py", line 2, in <module>
from quiz_maker.tests.generate_questions import main as question_list_func
File "C:[redacted]\testabode\Hoqui\hoqui\quiz_maker\tests\generate_questions.py", line 22, in <module>
sentence_beginning(text=first_words_of_sentence,category='Location').save()
File "C:[redacted]\lib\site-packages\django\db\models\base.py", line 718, in save
force_update=force_update, update_fields=update_fields)
File "C:[redacted]\lib\site-packages\django\db\models\base.py", line 748, in save_base
updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
File "C:[redacted]\lib\site-packages\django\db\models\base.py", line 831, in _save_table
result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
File "C:[redacted]\lib\site-packages\django\db\models\base.py", line 869, in _do_insert
using=using, raw=raw)
File "C:[redacted]\lib\site-packages\django\db\models\manager.py", line 82, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "C:[redacted]\lib\site-packages\django\db\models\query.py", line 1136, in _insert
return query.get_compiler(using=using).execute_sql(return_id)
File "C:[redacted]\lib\site-packages\django\db\models\sql\compiler.py", line 1289, in execute_sql
cursor.execute(sql, params)
File "C:[redacted]\lib\site-packages\django\db\backends\utils.py", line 100, in execute
return super().execute(sql, params)
File "C:[redacted]\lib\site-packages\django\db\backends\utils.py", line 68, in execute
return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
File "C:[redacted]\lib\site-packages\django\db\backends\utils.py", line 77, in _execute_with_wrappers
return executor(sql, params, many, context)
File "C:[redacted]\lib\site-packages\django\db\backends\utils.py", line 85, in _execute
return self.cursor.execute(sql, params)
File "C:[redacted]\lib\site-packages\django\db\utils.py", line 89, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "C:[redacted]\lib\site-packages\django\db\backends\utils.py", line 85, in _execute
return self.cursor.execute(sql, params)
File "C:[redacted]\lib\site-packages\django\db\backends\sqlite3\base.py", line 296, in execute
return Database.Cursor.execute(self, query, params)
django.db.utils.OperationalError: no such table: realestate_sentence_beginning