Sorry for duplication use this post
http://groups.google.com/group/google-appengine/browse_thread/thread/8e40a5dd298bfab4#

On Apr 17, 1:57 pm, buger <leons...@gmail.com> wrote:
> When i'm trying simply get some objects from db i getting error:
>
> videos = Video.all().fetch(100)
>   File "/base/python_lib/versions/1/google/appengine/ext/db/
> __init__.py", line 1391, in fetch
>     return map(self._model_class.from_entity, raw)
>   File "/base/python_lib/versions/1/google/appengine/ext/db/
> __init__.py", line 997, in from_entity
>     instance = cls(None, _from_entity=True, **entity_values)
>   File "/base/python_lib/versions/1/google/appengine/ext/db/
> __init__.py", line 596, in __init__
>     prop.__set__(self, value)
>   File "/base/python_lib/versions/1/google/appengine/ext/db/
> __init__.py", line 2581, in __set__
>     value = self.validate(value)
>   File "/base/python_lib/versions/1/google/appengine/ext/db/
> __init__.py", line 2611, in validate
>     if value is not None and not value.has_key():
> AttributeError: 'unicode' object has no attribute 'has_key'
>
> It happened after i made some changes in my model properties, and just
> trying to migrate data to new schema.
> And why Get() method checks required option of property? If i had old
> objects with such property with Null value, before i set require
> option, i can no get this object after update, because i'll have error
> required field error.
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