def update_instance(self, instance, remove=None, objects=None):
if remove is None:
remove = []
if objects is None:
objects = getattr(instance, self.from_field).all()
items = [self._prepare(o) for o in objects
if o not in remove]
instance.__dict__[self.name] = dumps(items)
instance.__class__.objects.filter(pk=instance.pk).update(
**{self.name: instance.__dict__[self.name]})
def get_prep_value(self, value):
if not isinstance(value, basestring):
value = dumps(value)
return super(DenormManyToManyField, self).get_prep_value(value)
