Thanks for taking time on this one. That definitely fixes the problem. I entered it in as Ticket #1556. I am willing to write a test for this defect, but have no idea how to check for this other than to turn on engine.echo and spot it on the console. > I have a theory what this is. Can you try this patch against 0.5.6: > > Index: lib/sqlalchemy/sql/expression.py > =================================================================== > --- lib/sqlalchemy/sql/expression.py (revision 6377) > +++ lib/sqlalchemy/sql/expression.py (working copy) > @@ -2011,7 +2011,11 @@ > the same type. > > """ > - return isinstance(other, _BindParamClause) and > other.type.__class__ == self.type.__class__ and self.value == other.value > + return isinstance(other, _BindParamClause) and \ > + len(set(other.type.__class__.__mro__).intersection( > + self.type.__class__.__mro__ > + )) > 3 \ > + and self.value == other.value > > def __getstate__(self): > """execute a deferred value for serialization purposes.""" > > > if that works let's make a trac ticket to add tests for this. > > > > >
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