Hi Matus!
> Is there any replacement to this / what is the best way to do it if I'd
like
> to call to_python on assignment?
If you'd like to have a field's `to_python()` called on assignement you
should
attach a descriptor[1] on the model class on `contribute_to_class()` that
calls
it.
e.g.
class Converter(object):
def __init__(self, field):
self.name = field.name
self.convert = field.to_python
def __get__(self, instance, owner=None):
if instance is None:
return self
try:
return instance.__dict__[self.name]
except KeyError:
return AttributeError(self.name)
def __set__(self, instance, value):
instance.__dict__[self.name] = self.convert(value)
class FieldConverterMixin(object):
def contribute_to_class(model, name):
super(FieldConverterMixin, self).contribute_to_class(model, name)
setattr(model, name, Converter(self))
This is mostly what SubfieldBase use to do.
Cheers,
Simon
Le samedi 5 décembre 2015 12:04:10 UTC-5, matus moravcik a écrit :
>
> Hi,
>
> according to the docs, SubfieldBase is going to be removed in 1.10 and
> replaced by from_db_value()
>
> https://docs.djangoproject.com/en/1.9/releases/1.8/#subfieldbase
>
> What puzzles me is this:
> "Note that the new approach does not call the to_python()
> <https://docs.djangoproject.com/en/1.9/ref/models/fields/#django.db.models.Field.to_python>
> method
> on assignment as was the case with SubfieldBase."
>
> I thought that was the main point of SubfieldBase. Is there any
> replacement to this / what is the best way to do it if I'd like to call
> to_python on assignment?
>
>
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