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from django.db.models.query_utils import DeferredAttribute
class AutoDeserializedAttribute(DeferredAttribute):
"""
Use as the descriptor_class for a Django custom field.
Allows setting the field to a serialized (typically string) value,
and immediately reflecting that as the deserialized `to_python` value.
(This requires that the field's `to_python` returns the same thing
whether called with a serialized or deserialized value.)
"""
# (Adapted from django.db.models.fields.subclassing.Creator,
# which was included in Django 1.8 and earlier.)
def __set__(self, instance, value):
value = self.field.to_python(value)
instance.__dict__[self.field.attname] = value
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