SA doesnt have this feature built in at the moment.  you can use a
property to acheive the desired effect:

class MyClass(object):
    someprop = property(lamba self:[x.someattribute for x in
self.comments])

it also might  be possible to use the AssociationProxy extension (see
sqlalchemy.ext.associationproxy) to achieve the same result with
reading/writing capability.


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