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