As theres a lot of clamor for this lately, FYI to those looking for a more flexible "select_by". the SelectResults extension can give you a lot of what youre looking for.

        from sqlalchemy.ext.selectresults import SelectResultsExt

        addressmapper = mapper(Address, addresstable)
usermapper = mapper(User, usertable, properties= {'addresses':addressmapper}, ext=SelectResultsExt())

result = usermapper.select_by(address='[EMAIL PROTECTED]').order_by (addresstable.c.address)[4:15]

will add "LIMIT 4 OFFSET 15 ORDER BY addresses.address" to the generated query before executing.






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