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Field Change - Check if a field has changed before saving a model. #django #python #view
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| def has_changed(instance, field): | |
| if not instance.pk: | |
| return False | |
| old_value = instance.__class__._default_manager.filter(pk=instance.pk).values(field).get()[field] | |
| return not getattr(instance, field) == old_value |
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