问django.db.utils.InterfaceError:连接已关闭

EN

`InterfaceError: connection already closed
  File "django/core/handlers/exception.py", line 55, in inner
    response = get_response(request)
  File "django/core/handlers/base.py", line 197, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "contextlib.py", line 79, in inner
    return func(*args, **kwds)
  File "django/views/generic/base.py", line 84, in view
    return self.dispatch(request, *args, **kwargs)
  File "django/utils/decorators.py", line 46, in _wrapper
    return bound_method(*args, **kwargs)
  File "django/views/decorators/cache.py", line 62, in _wrapped_view_func
    response = view_func(request, *args, **kwargs)
  File "django/views/generic/base.py", line 119, in dispatch
    return handler(request, *args, **kwargs)
  File "django/views/generic/detail.py", line 108, in get
    self.object = self.get_object()
  File "django/views/generic/detail.py", line 53, in get_object
    obj = queryset.get()
  File "django/db/models/query.py", line 492, in get
    num = len(clone)
  File "django/db/models/query.py", line 302, in __len__
    self._fetch_all()
  File "django/db/models/query.py", line 1507, in _fetch_all
    self._result_cache = list(self._iterable_class(self))
  File "django/db/models/query.py", line 57, in __iter__
    results = compiler.execute_sql(
  File "django/db/models/sql/compiler.py", line 1359, in execute_sql
    cursor = self.connection.cursor()
  File "django/utils/asyncio.py", line 26, in inner
    return func(*args, **kwargs)
  File "django/db/backends/base/base.py", line 284, in cursor
    return self._cursor()
  File "django/db/backends/base/base.py", line 262, in _cursor
    return self._prepare_cursor(self.create_cursor(name))
  File "django/db/utils.py", line 91, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "django/db/backends/base/base.py", line 262, in _cursor
    return self._prepare_cursor(self.create_cursor(name))
  File "django/utils/asyncio.py", line 26, in inner
    return func(*args, **kwargs)
  File "django/db/backends/postgresql/base.py", line 256, in create_cursor
    cursor = self.connection.cursor()`