This is an issue related to #27118. Anthony King commented on it but that issue is closed so I am opening a new one. The field validation introduced in 1.11 update_or_create will throw a FieldError if a defaults argument contains a value that is set through an @property.setter on that model. On the other hand create continues to function correctly. Ideally they'd behave consistently.
Here is an example.
# create works, update_or_create does not. Should neither work?
class Choice(models.Model):
poll = models.ForeignKey(Poll)
choice_text = models.CharField(max_length=200)
votes = models.IntegerField(default=0)
_credit = models.DecimalField('Credit', decimal_places = 5, max_digits=11, null=True)
@property
def credit(self):
return 0 if self._credit is None else self._credit
@credit.setter
def credit(self, value):
self._credit = value
In [7]: mk = Choice.objects.create(credit=123.3, poll_id=1)
In [8]: mk
Out[8]: <Choice: >
In [9]: mk.__dict__
Out[9]:
{'_credit': 123.3,
'_state': <django.db.models.base.ModelState at 0x1116e3650>,
'choice_text': u'',
'id': 2,
'poll_id': 1,
'votes': 0}
In [10]: ok = Choice.objects.update_or_create(defaults={'credit':123.3}, poll_id=1)
---------------------------------------------------------------------------
FieldError Traceback (most recent call last)
<ipython-input-10-147ffa08785c> in <module>()
----> 1 ok = Choice.objects.update_or_create(defaults={'credit':123.3}, poll_id=1)
/usr/local/lib/python2.7/site-packages/django/db/models/manager.pyc in manager_method(self, *args, **kwargs)
83 def create_method(name, method):
84 def manager_method(self, *args, **kwargs):
---> 85 return getattr(self.get_queryset(), name)(*args, **kwargs)
86 manager_method.__name__ = method.__name__
87 manager_method.__doc__ = method.__doc__
/usr/local/lib/python2.7/site-packages/django/db/models/query.pyc in update_or_create(self, defaults, **kwargs)
474 """
475 defaults = defaults or {}
--> 476 lookup, params = self._extract_model_params(defaults, **kwargs)
477 self._for_write = True
478 with transaction.atomic(using=self.db):
/usr/local/lib/python2.7/site-packages/django/db/models/query.pyc in _extract_model_params(self, defaults, **kwargs)
530 "Invalid field name(s) for model %s: '%s'." % (
531 self.model._meta.object_name,
--> 532 "', '".join(sorted(invalid_params)),
533 ))
534 return lookup, params
FieldError: Invalid field name(s) for model Choice: 'credit'.