Hello,
I'm experiencing an unusual problem with django where it's sometimes
throwing a TypeError exception with the exception value "unsupported
operand type(s) for *: 'Decimal' and 'Decimal'" when multiplying a
DecimalField by a Decimal. This seems to happen for about 20% of
requests to a view, and is more frequent when the requests are
concurrent.
The code that's throwing the exception is the first return in this
simple class method on a model:
def CO2e(self, *args, **kwargs):
if(kwargs.get('qty', None) != None):
return self.factor*self.type.equivalency*Decimal(kwargs['qty'])
return self.factor*self.type.equivalency
where factor and equivalency are both django DecimalFields on models,
and Decimal is the standard python Decimal class from the decimal
package.
(According to the exception page the value of kwargs is {'qty':
u'464.02'} in the case I'm currently debugging. It doesn't what the
value of qty is, it's a unicode string which the Decimal class should
be able to handle.)
The only somewhat related information I can find online is this thread:
http://groups.google.com/group/django-users/browse_thread/thread/91aa6c088f6c090/929f2fd69307cd22
but the link to the the psycopg ticket no longer works and just goes
to a rant about how the author hates trac. I'm not convinced that it
is that bug since the environment is already running under mod_wsgi,
which the django-users thread suggests fixes the problem. The
environment is using the postgres database engine, and has psycopg
2.0.7 installed on it.
So a couple of questions:
1. Is the bug described in that thread still an issue? It's a fairly
old thread.
2. Does anyone have any suggestions for where else to poke for
debugging this?
- Dave
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