gistfile1.txt

    def from_native(self, data, files):
        identity = self.get_identity(data)
        if identity:
            obj = self.opts.model.objects.get(id=identity)
            dirty = False
            for field_name, field_serializer in self.fields.items():
                val = field_serializer.from_native(data[field_name])
                if getattr(obj, field_name) != val:
                    setattr(obj, field_name, val)
                    dirty = True
            if dirty:
                obj.save()
        else:
            obj = super(YourSerializer, self).from_native(data, files)
        return obj