在DRF 3中的ModelSerializer上添加非模型字段

问题描述

如何在DRF 3中的ModelSerializer上添加非模型字段？例如，添加我的实际模型中不存在的字段？

How do add a non-model field on a ModelSerializer in DRF 3? i.e. add a field that does not exist on my actual model?

class TestSerializer(serializers.ModelSerializer):
    url = serializers.HyperlinkedIdentityField(view_name='vote_detail')
    non_field = serializers.CharField()  # no corresponding model property.


    class Meta:
        model = vote_model
        fields = ("url", "non_field")

    def create(self, validated_data):
      print(direction=validated_data['non_field'])

但是DRF 3给我一个错误：

But DRF 3 gives me the error:

Got AttributeError when attempting to get a value for field `non_field` on serializer `TestSerializer`.
The serializer field might be named incorrectly and not match any attribute or key on the `Test` instance.
Original exception text was: 'Test' object has no attribute 'non_field'.

我已经搜索了堆栈，并找到了一些解决方案，但这些解决方案都引用了DRF 2，其中我正在使用DRF 3.在此版本上是否有解决方案？

I have searched stack DRF - ModelSerializer with a non-model write_only field and found a few solutions but these refer to DRF 2 where I'm using DRF 3. Is there a solution for this on this version?

推荐答案

class TestSerializer(serializers.ModelSerializer):
    url = serializers.HyperlinkedIdentityField(view_name='vote_detail')
    non_field = serializers.SerializerMethodField()  # no corresponding model property.

    class Meta:
        model = vote_model
        fields = ("url", "non_field")

    def create(self, validated_data):
        print(direction=validated_data['non_field'])

或通过以下

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