On Sun, Jan 25, 2009 at 08:35:03PM -0800, Daniel Fetchinson wrote:
> When using a PickleCol with default={ } the behaviour is not exactly
> what I would expect:
>
> ######################################################################
> from sqlobject import *
> sqlhub.processConnection = connectionForURI( 'sqlite:///:memory:', debug=True
> )
> class t( SQLObject ):
> x = PickleCol( default={} )
> t.createTable( )
> row = t( )
> print row.x # this will print None
> ######################################################################
>
> Having a non-empty dict works as expected though. I had a feeling it
> was related to mutable keyword argument values and the associated
> problems, but the same problem is there with an empty tuple which is
> certainly unmutable.
>
> Is this a bug or a feature?
Seems like a bug related to boolean testing of objects. I.e., somewhere
there is a code that does
if object:...
instead of
if object is None:...
But a quick glance at PickleCol code didn't reveal a clue.
Oleg.
--
Oleg Broytmann http://phd.pp.ru/ [email protected]
Programmers don't die, they just GOSUB without RETURN.
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