#12546: Definining __len__ on a model object breaks it's serialization
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Reporter: casbon | Owner: nobody
Status: new | Milestone:
Component: Core framework | Version: 1.1
Resolution: | Keywords:
Stage: Unreviewed | Has_patch: 0
Needs_docs: 0 | Needs_tests: 0
Needs_better_patch: 0 |
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Changes (by claudep):
* needs_better_patch: => 0
* needs_tests: => 0
* needs_docs: => 0
Comment:
Been confronted to the same issue today. On one side, the object can
workaround this by defining the {{{__nonzero__}}} method (see
[http://docs.python.org/reference/datamodel.html#object.__len__]). On the
other side, the test here is not to know if the object evaluates to True
or False, but if it can be queried for the attribute.
What about:
{{{
def _get_val_from_obj(self, obj):
return getattr(obj, self.get_attname(), self.get_default())
}}}
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Ticket URL: <http://code.djangoproject.com/ticket/12546#comment:1>
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