多次编写应用程序时，我不得不删除数据库并重新运行迁移。这始终可以通过简单地删除数据库文件然后运行manage.py migrate来实现。但是，现在当我尝试执行此操作时，出现一个错误，提示django.db.utils.OperationalError: no such table: Planner_course，其中Planner是我的应用程序名称，而Course是我的类架构之一。我基本上在做什么follows this answer。我不确定为什么不到一个星期前我可以使用此方法重置数据库，但现在不能。有人有什么想法吗？如果我运行makemigrations migrate甚至甚至是runserver，都会出错，因为在其他情况下，当我重新运行无数据库的迁移时，它只会重新制作数据库并应用迁移。这是完整的错误代码：
"C:\Program Files\JetBrains\PyCharm 2019.3.3\bin\runnerw64.exe" C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\python.exe "C:\Program Files\JetBrains\PyCharm 2019.3.3\plugins\python\helpers\pycharm\django_manage.py" migrate C:/Users/cabra/OneDrive/Desktop/CoursePlanner
Tracking file by folder pattern: migrations
Traceback (most recent call last):
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\backends\utils.py", line 86, in _execute
return self.cursor.execute(sql, params)
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\backends\sqlite3\base.py", line 396, in execute
return Database.Cursor.execute(self, query, params)
sqlite3.OperationalError: no such table: Planner_course
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "C:\Program Files\JetBrains\PyCharm 2019.3.3\plugins\python\helpers\pycharm\django_manage.py", line 52, in <module>
run_command()
File "C:\Program Files\JetBrains\PyCharm 2019.3.3\plugins\python\helpers\pycharm\django_manage.py", line 46, in run_command
run_module(manage_file, None, '__main__', True)
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\runpy.py", line 206, in run_module
return _run_module_code(code, init_globals, run_name, mod_spec)
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\runpy.py", line 96, in _run_module_code
_run_code(code, mod_globals, init_globals,
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\runpy.py", line 86, in _run_code
exec(code, run_globals)
File "C:/Users/cabra/OneDrive/Desktop/CoursePlanner\manage.py", line 21, in <module>
main()
File "C:/Users/cabra/OneDrive/Desktop/CoursePlanner\manage.py", line 17, in main
execute_from_command_line(sys.argv)
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\core\management\__init__.py", line 401, in execute_from_command_line
utility.execute()
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\core\management\__init__.py", line 395, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\core\management\base.py", line 328, in run_from_argv
self.execute(*args, **cmd_options)
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\core\management\base.py", line 366, in execute
self.check()
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\core\management\base.py", line 392, in check
all_issues = self._run_checks(
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\core\management\commands\migrate.py", line 64, in _run_checks
issues.extend(super()._run_checks(**kwargs))
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\core\management\base.py", line 382, in _run_checks
return checks.run_checks(**kwargs)
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\core\checks\registry.py", line 72, in run_checks
new_errors = check(app_configs=app_configs)
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\core\checks\urls.py", line 13, in check_url_config
return check_resolver(resolver)
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\core\checks\urls.py", line 23, in check_resolver
return check_method()
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\urls\resolvers.py", line 407, in check
for pattern in self.url_patterns:
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\utils\functional.py", line 48, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\urls\resolvers.py", line 588, in url_patterns
patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\utils\functional.py", line 48, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\urls\resolvers.py", line 581, in urlconf_module
return import_module(self.urlconf_name)
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\importlib\__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
File "<frozen importlib._bootstrap>", line 991, in _find_and_load
File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 783, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "C:/Users/cabra/OneDrive/Desktop/CoursePlanner\CoursePlanner\urls.py", line 21, in <module>
path('', include('Planner.urls'))
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\urls\conf.py", line 34, in include
urlconf_module = import_module(urlconf_module)
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\importlib\__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
File "<frozen importlib._bootstrap>", line 991, in _find_and_load
File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 783, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "C:/Users/cabra/OneDrive/Desktop/CoursePlanner\Planner\urls.py", line 2, in <module>
from . import views
File "C:/Users/cabra/OneDrive/Desktop/CoursePlanner\Planner\views.py", line 15, in <module>
for course in courses:
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\models\query.py", line 276, in __iter__
self._fetch_all()
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\models\query.py", line 1261, in _fetch_all
self._result_cache = list(self._iterable_class(self))
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\models\query.py", line 57, in __iter__
results = compiler.execute_sql(chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size)
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\models\sql\compiler.py", line 1144, in execute_sql
cursor.execute(sql, params)
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\backends\utils.py", line 100, in execute
return super().execute(sql, params)
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\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:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\backends\utils.py", line 77, in _execute_with_wrappers
return executor(sql, params, many, context)
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\backends\utils.py", line 86, in _execute
return self.cursor.execute(sql, params)
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\utils.py", line 90, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\backends\utils.py", line 86, in _execute
return self.cursor.execute(sql, params)
File "C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\db\backends\sqlite3\base.py", line 396, in execute
return Database.Cursor.execute(self, query, params)
django.db.utils.OperationalError: no such table: Planner_course
Process finished with exit code 1
由于某种原因，我最终也通过擦除所有imports.py来解决了这个问题。在这种情况下，我对其他人的建议：
然后，如果保留迁移，则运行migrations；如果不保留，则运行makemigrations
这应该重建您的数据库。将此新数据库复制到您将记住的文件夹中
从备份还原所有文件
将新数据库复制到还原的项目中（替换旧数据库）
欢呼声