谷歌AppEngine告诉我,我的int不是一个int

Question

代码的相关部分:

pk = int(pk)                              
logging.info('pk: %r :: %s', pk, type(pk))
instance = models.Model.get_by_id(int(pk))       

上面的日志消息的输出

pk: 757347 :: <type 'int'>

堆栈跟踪:

Traceback (most recent call last):
  File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/webapp/__init__.py", line 634, in __call__
    handler.get(*groups)
  File "/base/data/home/apps/<myapp>/<version>/scrape.py", line 61, in get
    instance = models.Model.get_by_id(int(pk))
  File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/db/__init__.py", line 1212, in get_by_id
    return get(keys[0], config=config)
  File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/db/__init__.py", line 1434, in get
    model = cls1.from_entity(entity)
  File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/db/__init__.py", line 1350, in from_entity
    instance = cls(None, _from_entity=True, **entity_values)
  File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/db/__init__.py", line 890, in __init__
    prop.__set__(self, value)
  File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/db/__init__.py", line 593, in __set__
    value = self.validate(value)
  File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/db/__init__.py", line 2967, in validate
    % (self.name, type(value).__name__))
BadValueError: Property pk must be an int or long, not a unicode

任何人都知道我在这里做错了吗？

注意:int从代码的最后一行删除没有区别(这是第一个版本).

此外,代码工作没有问题dev_appserver.py.

Answer 1

你的模型是否有一个属性'pk',它现在是一个IntegerProperty(),但以前是一个StringProperty(),而id为757347的实体是用旧版本的模型保存的？