On Mar 21, 2010, at 6:20 PM, Matthew wrote:
> I got around this by switching to declarative and declaring my
> property like this:
>
> _id = column_property(Column("id",Integer,primary_key=True),
> comparator_factory=some_comparator_factory())
>
> And then used @synonym_for for the getter:
>
> @synonym_for("_id")
> @property
> def id(self):
> return some_function(self._id)
>
> I'm still not sure what was wrong with my original code, so would be
> interested in any comments, for academic reasons.
your original test appeared to have a class descending from object.
comparable_using applies to declarative classes. If you were using mapper(),
you'd take the output from comparable_using and pass it to the "properties"
dictionary of mapper() - but more likely you'd use comparable_property()
directly pass your comparator straight in to column_property(), as introduced
in http://www.sqlalchemy.org/docs/mappers.html#custom-comparators and linking
to an example at
http://www.sqlalchemy.org/docs/reference/orm/mapping.html#sqlalchemy.orm.comparable_property
.
>
> Thank you!
>
> Matthew
>
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