无法在Django中删除数据库并重新应用迁移？

在编写应用程序的过程中，我多次不得不删除数据库并重新运行迁移。这通常只需删除数据库文件，然后运行

manage.py migrate

。但是现在当我尝试这样做时，我得到一个错误，说

django.db.utils.OperationalError:没有这样的表：Planner\u course

，其中Planner是我的应用程序名，course是我的类模式之一。基本上我在做什么。我不确定为什么不到一周前我能用这个方法重置我的数据库，而现在我不能。有人有什么想法吗？无论是运行

makemigrations

migrate

还是运行

runserver

，我都会遇到错误，因为每当我重新运行没有db的迁移时，它都会简单地重新生成db并应用迁移。以下是完整的错误代码：

"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

“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\u manage.py”迁移C:/Users/cabra/OneDrive/Desktop/CoursePlanner
按文件夹模式跟踪文件：迁移
回溯（最近一次呼叫最后一次）：
文件“C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site packages\django\db\backends\utils.py”，第86行，在\u execute中
返回self.cursor.execute（sql，params）
文件“C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site packages\django\db\backends\sqlite3\base.py”，第396行，在execute中
返回Database.Cursor.execute（self、query、params）
sqlite3.0错误：没有这样的表：Planner\u课程
上述异常是以下异常的直接原因：
回溯（最近一次呼叫最后一次）：
文件“C:\Program Files\JetBrains\PyCharm 2019.3.3\plugins\python\helpers\PyCharm\django_manage.py”，第52行，在
运行_命令（）
文件“C:\Program Files\JetBrains\PyCharm 2019.3.3\plugins\python\helpers\PyCharm\django\u manage.py”，第46行，在run\u命令中
运行\u模块（管理\u文件，无，'.\u主\u'，真）
文件“C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\runpy.py”，第206行，在run\u模块中
返回\u运行\u模块\u代码（代码、初始化全局、运行\u名称、模块规格）
文件“C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\runpy.py”，第96行，在运行模块代码中
_运行代码（代码、mod_globals、init_globals、，
文件“C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\runpy.py”，第86行，在运行代码中
exec（代码、运行\全局）
文件“C:/Users/cabra/OneDrive/Desktop/courseplan\manage.py”，第21行，在
main（）
文件“C:/Users/cabra/OneDrive/Desktop/courseplan\manage.py”，第17行，主目录
从命令行（sys.argv）执行命令
文件“C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site packages\django\core\management\\uuuuuuuu init\uuuuuuuuu.py”，第401行，从命令行执行
utility.execute（）
文件“C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site packages\django\core\management\\ uuuuuuu init\uuuuuuuu.py”，第395行，在execute中
self.fetch_命令（子命令）。从_argv（self.argv）运行_
文件“C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site-packages\django\core\management\base.py”，第328行，从\u argv运行
self.execute（*args，**cmd_选项）
文件“C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site packages\django\core\management\base.py”，第366行，在execute中
self.check（）
检查文件“C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site packages\django\core\management\base.py”，第392行
所有问题=自我。运行检查(
文件“C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site packages\django\core\management\commands\migrate.py”，第64行，在运行检查中
问题.扩展（超级（）.\u运行\u检查（**kwargs））
文件“C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site packages\django\core\management\base.py”，第382行，在运行检查中
返回检查。运行检查（**kwargs）
文件“C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site packages\django\core\checks\registry.py”，第72行，运行检查
新建错误=检查（应用程序配置=应用程序配置）
文件“C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site packages\django\core\checks\url.py”，第13行，在check\u url\u config中
返回检查\u分解器（分解器）
文件“C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site packages\django\core\checks\url.py”，第23行，在check\u解析器中
返回检查方法（）
检查文件“C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site packages\django\url\resolvers.py”，第407行
对于self.url_模式中的模式：
文件“C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site packages\django\utils\functional.py”，第48行，在__
res=instance.\uuuu dict\uuuu[self.name]=self.func（实例）
文件“C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site packages\django\url\resolvers.py”，第588行，url\U模式
patterns=getattr（self.urlconf_模块，“urlpatterns”，self.urlconf_模块）
文件“C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site packages\django\utils\functional.py”，第48行，在__
res=instance.\uuuu dict\uuuu[self.name]=self.func（实例）
urlconf_模块中的文件“C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\site packages\django\url\resolvers.py”，第581行
返回导入_模块（self.urlconf_名称）
文件“C:\Users\cabra\AppData\Local\Programs\Python\Python38-32\lib\importlib\\uuuuuu init\uuuuuu.py”，第127行，在导入模块中
return _bootstrap._gcd_import（名称[级别：]，包，级别）
文件“”，第1014行，在\u gcd\u导入中
文件“”，第991行，在“查找”和“加载”中
文件“”，第975行，在“查找”和“加载”中解锁
文件“”，第671行，在\u加载\u解锁
exec_模块中第783行的文件“”
文件“”，第219行，在“调用”中，删除了“帧”
文件“C:/Users/cabra/OneDrive/Desk