2

嗨，我想在 REST 服务上只提供一对没有键的值：

看看我的serializers.py：

 class TranslationSerializer(serializers.ModelSerializer):
        translated_term = serializers.CharField(read_only=True)

        class Meta:
                model = Translation
                fields = ('language','translated_term')

class VocabSerializer(serializers.ModelSerializer):
       ...
        translates = TranslationSerializer(many=True, read_only=True)
       ...

        class Meta:
        model = Vocab
        fields = ( ..., 'translates',...)

结果如下：

"translates": [
        {
            "language": "EN",
            "translated_term": "Chair"
        }
        {
            "language": "IT",
            "translated_term": "asd"
        }
    ],

如您所见，此结果将字段名称显示为该字段值旁边的 dict 键。但我想有一个不同的结构。如下所示：

    "translates": [
        {
            "EN": "Chair", "IT":"asd"
        }
    ],

此示例显示了一对键/值，其中键是语言字段值，字典的值是翻译字段的值。

如何仅显示带有“已翻译”字段的“语言”字段的值对而没有字段名称？

4

2 回答 2

9

您可以通过自定义列表序列化程序来实现它：

class TranslationListSerializer(serializers.ListSerializer):
    def to_representation(self, data):
        r = super().to_representation(data)

        return { item['language']: item['translated_term'] for item in r }

class TranslationSerializer(serializers.ModelSerializer):
    translated_term = serializers.CharField(read_only=True)

    class Meta:
            model = Translation
            fields = ('language','translated_term')
            list_serializer_class = TranslationListSerializer
于 2015-07-24T08:54:53.260 回答
3

通过为序列化程序创建自定义to_representation函数，您可以控制字典表示。

 class TranslationSerializer(serializers.ModelSerializer):
        translated_term = serializers.CharField(read_only=True)

        def to_representation(self, instance):
            # get the instance -> Dict of primitive data types
            representation = super(TranslationSerializer, self).to_representation(instance)

            # manipulate returned dictionary as desired
            language = representation.pop('language')
            translated_term = representation.pop('translated_term')

            # repackage
            repackaged = {language: translated_term}

            return repackaged

        class Meta:
                model = Translation
                fields = ('language','translated_term')

这将生成 JSON 格式为

"translates": [
        {
            "EN": "Chair"
        },
            "IT": "asd"
        }
    ],

然而，这并不是你想要的样子，也许 VocabSerializer 的自定义“to_representation”可以实现。

于 2015-07-23T09:48:47.487 回答