Django错误：AttributeError: 'NoneType'对象没有属性'db

Question

有没有人见过这个错误？每当我尝试在我的某个模型上执行查询时，就会出现这个错误。直接查询数据库是没问题的，其他模型也没有这个问题。

比如，它是由类似下面的代码引发的：

MyModel.objects.get(name__iexact = 'an existent name')

我觉得这个问题是在我用South进行数据库迁移后立刻出现的。我可以回滚这个迁移，但我不想让事情变得更糟，所以我先来这里问问。

Django 1.3
PostgreSQL 8.4.8
Python 2.7.0
iPython 0.10.2
Ubuntu 10.10 64位

有什么想法吗？

ERROR: An unexpected error occurred while tokenizing input
The following traceback may be corrupted or invalid
The error message is: ('EOF in multi-line statement', (173, 0))

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)

/home/<path to python>/<ipython console> in <module>()

/home/<path to python>/python2.7/site-packages/django/db/models/manager.pyc in get(self, *args, **kwargs)
    130 
    131     def get(self, *args, **kwargs):
--> 132         return self.get_query_set().get(*args, **kwargs)
    133 
    134     def get_or_create(self, **kwargs):

/home/<path to python>/python2.7/site-packages/django/db/models/query.pyc in get(self, *args, **kwargs)
    342         if self.query.can_filter():
    343             clone = clone.order_by()
--> 344         num = len(clone)
    345         if num == 1:
    346             return clone._result_cache[0]

/home/<path to python>/python2.7/site-packages/django/db/models/query.pyc in __len__(self)
     80                 self._result_cache = list(self._iter)
     81             else:
---> 82                 self._result_cache = list(self.iterator())
     83         elif self._iter:
     84             self._result_cache.extend(self._iter)

/home/<path to python>/python2.7/site-packages/django/db/models/query.pyc in iterator(self)
    287 
    288                 # Store the source database of the object

--> 289                 obj._state.db = db
    290                 # This object came from the database; it's not being added.

    291                 obj._state.adding = False

AttributeError: 'NoneType' object has no attribute 'db'

django ubuntu postgresql 数据库迁移 attributeerror 模型查询 none类型 south

Django错误：AttributeError: 'NoneType'对象没有属性'db

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