you could probably also address this with the example ive been dishing
out lately, the "unique instance" wiki recipe at :
http://www.sqlalchemy.org/trac/wiki/UsageRecipes/UniqueObject
that way youd just be able to say:
host.platform = Platform('windows')
host.platform = Platform('bogus')
and existing vs. new is handled for you.
however, it does *not* really let you do this:
host.platform.name = 'bogus'
but i think that since a Platform's identity is its name, you should
use a new Platform instance anyway.
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