Django的REST框架自定义字段只对值（无字段名作为字典键）(Django Rest Frame

嗨，我想只提供对值不会对REST服务键：

拿上我的serializers.py看看：

 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"
        }
    ],

你可以看到这个结果表明，该字段旁边字段的值字典键的名称。 但我想有不同的结构。 像下面这样：

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

这个例子示出了对键/值，其中键是语言字段值和字典的值是翻译的字段的值。

我怎么能只显示对与“翻译”场“语言”字段的值，而不字段的名称？

Answer 1:

您可以通过定制实现它列表串行 ：

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

Answer 2:

通过创建自定义to_representation的串行功能，你可以在你的字典表示控制。

 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')

这将在格式生成JSON

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

但是，你怎么希望它看起来，也许是VocabSerializer自定义“to_representation”可以瓶坯，这是不完全的。

文章来源: Django Rest Framework custom field only pair of values (without fieldname as dict key)