mysql - 新的 mysql 数据库出现 "mydb.background_task doesn' t 存在”- Django

Question

我全新安装了一个使用background_tasks的django应用程序。如果我删除使用background_task的模型，那么我就可以做到

python manage.py makemigrations

但是，如果我保留它们，则会出现表丢失异常:

"mydb.background_task doesn't exist"

我见过其他人遇到这个问题，但我已经尝试了每一个建议: - 删除所有迁移文件 - 删除sqlite3转储文件 - 卸载 django 和 django-background-tasks - 确保我的机器即使在 virtualenv 之外也没有安装这两个软件包 - 我尝试删除我的 virtualenv 并重新安装所有内容。

我已经尝试了所有这些事情，但 python manage.py makemigrations 仍然给我这个异常。但没有其他方法可以做到这一点。

Django==2.1.5
django-background-tasks==1.2.0
django-compat==1.0.15
django-mysql==3.2.0

p.s:我正在使用 Cloud SQL，我不知道这是否会影响任何事情，我不这么认为。 mysql 也有同样的问题

编辑: 添加跟踪

Traceback (most recent call last):
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/db/backends/utils.py", line 85, in _execute
    return self.cursor.execute(sql, params)
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/db/backends/mysql/base.py", line 71, in execute
    return self.cursor.execute(query, args)
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/MySQLdb/cursors.py", line 198, in execute
    res = self._query(query)
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/MySQLdb/cursors.py", line 304, in _query
    db.query(q)
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/MySQLdb/connections.py", line 217, in query
    _mysql.connection.query(self, query)
MySQLdb._exceptions.ProgrammingError: (1146, "Table 'zynqdb_dev.background_task' doesn't exist")

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 "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
    utility.execute()
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/core/management/__init__.py", line 375, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/core/management/base.py", line 316, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/core/management/base.py", line 350, in execute
    self.check()
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/core/management/base.py", line 379, in check
    include_deployment_checks=include_deployment_checks,
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/core/management/base.py", line 366, in _run_checks
    return checks.run_checks(**kwargs)
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/core/checks/registry.py", line 71, in run_checks
    new_errors = check(app_configs=app_configs)
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/core/checks/urls.py", line 13, in check_url_config
    return check_resolver(resolver)
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/core/checks/urls.py", line 23, in check_resolver
    return check_method()
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/urls/resolvers.py", line 396, in check
    for pattern in self.url_patterns:
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/utils/functional.py", line 37, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/urls/resolvers.py", line 533, in url_patterns
    patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/utils/functional.py", line 37, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/urls/resolvers.py", line 526, in urlconf_module
    return import_module(self.urlconf_name)
  File "/Users/cottrell/tessel/venv/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/Users/cottrell/tessel/tesselapp/tesselapp/urls.py", line 49, in <module>
    one_time_setup_background(priority=10)
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/background_task/tasks.py", line 296, in __call__
    remove_existing_tasks)
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/background_task/tasks.py", line 239, in schedule
    task.save()
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/background_task/models.py", line 315, in save
    return super(Task, self).save(*arg, **kw)
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/db/models/base.py", line 718, in save
    force_update=force_update, update_fields=update_fields)
  File "/Users/cottrell/tessel/venv/lib/python3.7/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 "/Users/cottrell/tessel/venv/lib/python3.7/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 "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/db/models/base.py", line 869, in _do_insert
    using=using, raw=raw)
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/db/models/manager.py", line 82, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/db/models/query.py", line 1136, in _insert
    return query.get_compiler(using=using).execute_sql(return_id)
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/db/models/sql/compiler.py", line 1289, in execute_sql
    cursor.execute(sql, params)
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/db/backends/utils.py", line 100, in execute
    return super().execute(sql, params)
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/db/backends/utils.py", line 68, in execute
    return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/db/backends/utils.py", line 77, in _execute_with_wrappers
    return executor(sql, params, many, context)
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/db/backends/utils.py", line 85, in _execute
    return self.cursor.execute(sql, params)
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/db/utils.py", line 89, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/db/backends/utils.py", line 85, in _execute
    return self.cursor.execute(sql, params)
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/django/db/backends/mysql/base.py", line 71, in execute
    return self.cursor.execute(query, args)
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/MySQLdb/cursors.py", line 198, in execute
    res = self._query(query)
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/MySQLdb/cursors.py", line 304, in _query
    db.query(q)
  File "/Users/cottrell/tessel/venv/lib/python3.7/site-packages/MySQLdb/connections.py", line 217, in query
    _mysql.connection.query(self, query)
django.db.utils.ProgrammingError: (1146, "Table 'zynqdb_dev.background_task' doesn't exist")

我也已经尝试过:

find . -path "*/migrations/*.pyc"  -delete
find . -path "*/migrations/*.py" -not -name "__init__.py" -delete

我尝试过重新安装和卸载。

此外，如果我执行 python manage.py showmigrations，也会发生同样的错误。

这是模型的一部分，如果我注释掉@background，它就可以工作，但是如果我注释掉@background，它就不起作用。

def one_time_setup():
    if settings.SENTRY_TOKEN:
        sentry_sdk.init(
            settings.SENTRY_TOKEN,
            integrations=[DjangoIntegration()]
        )


#@background()
def one_time_setup_background():
    one_time_setup()


# Do one-time setup in django app, and background with high priority.
one_time_setup()
one_time_setup_background()

Answer 1

库中似乎存在问题，请参阅 https://github.com/arteria/django-background-tasks/issues/204 。您可能需要暂时删除代码以迁移数据库。