python - 如何仅使用一个序列化器MethodField 获取两个值

Question

当'content'字段被排除时，我想在'sth'字段添加“NOT content contains”，否则“content contatined”

序列化器.py

class PostSerializer(serializers.ModelSerializer):
    sth = serializers.SerializerMethodField()

    class Meta:
        model = Post
        fields = ('id', 'sth', 'content', 'created',)

    def get_sth(self, obj):
        return 

回复我想要得到的内容

[
    {
      "id": "1",
      "sth": "content contained",
      "content": "a",
      "created": "2020-01-23"
    },
    {
      "id": "3",
      "sth": "NOT content contained",
      "created": "2020-01-22"
    },
]

我怎样才能得到像上面这样的回复。

Answer 1

在您的 to_representation 方法中修改它，如下所示

class PostSerializer(serializers.ModelSerializer):

    class Meta:
        model = Post
        fields = ('id', 'content', 'created',)

    def to_representation(self, instance):
        data = super().to_representation(instance)
        if content is not included:
           data.update({'sth': "content contained"})
        else:
           data.update({'sth': "NOT content contained"})
        return data

您必须根据您的系统设置不包含内容条件。