我发现此解决方案是最简单的。
from collections import OrderedDict
from rest_framework import serializers
class NonNullModelSerializer(serializers.ModelSerializer):
def to_representation(self, instance):
result = super(NonNullModelSerializer, self).to_representation(instance)
return OrderedDict([(key, result[key]) for key in result if result[key] is not None])
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