On Mon, Feb 07, 2011 at 01:32:52PM -0500, Michael Bayer wrote:
> >> Otherwise you can append your AttributeExtension into the listeners
> >> collection on the attribute, I'd have to check the source of attributes.py
> >> to recall the exact name of the collection.
> >
> > a hint here would be appreciated.
>
> heh, "check attributes.py" is a hint. The actual answer is,
> MyClass.someattribute.impl.extensions.append(my_extension).
correct! so thanks for the actual answer! ;-)
It seems that .impl only exists after I instantiated at leat 1 object, correct?
class User(Base):
__tablename__ = 'user'
id = Column(Integer, primary_key=True)
name = Column(String(30), nullable=False)
In [1]: print User.name.impl
None
In [2]: User()
Out[2]: <__main__.User object at 0x8a9cf6c>
In [3]: User.name.impl
Out[3]: <sqlalchemy.orm.attributes.ScalarAttributeImpl object at 0x8aa00cc>
sandro
*:-)
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