Storing persistent object in object outside of ZODB can incur in the
problem of passing object(s) between threads, and, therefore, passing
one object which is related to a connection on the ZODB to another
context with a different connection.

Also, AFAIK, keep in mind _v_ attributes are not involved in
transaction machinery of Zope. This means that if you have an error
inside you transaction after you modified the _v_ cache, you will have
the cache modified even tough the transaction has been aborted.

Regards
Marco

--
Marco Bizzarri
http://iliveinpisa.blogspot.com/
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