Django REST框架的ManyRelatedField序列化

Question

我试图用Django Rest框架序列化我的模型 - http://django-rest-framework.org/

我想要的是序列化其中包含ManyToMany关系的模型:

class ImageResource(models.Model):
    # Some code here
    image = models.ImageField(upload_to=upload_images_to)
    keywords = models.ManyToManyField('cards.Keyword', related_name='image_keywords', blank=True);
    # More code here

所以这是我的模型(我删除了一些字段以帮助您专注于关键字字段)

我的serialallizer看起来像这样:

class ImageResourceSerializer(serializers.HyperlinkedModelSerializer):
    keywords = serializers.ManyRelatedField(source='keywords')

    class Meta:
        model = ImageResource
        fields = ('id', 'url', 'image', 'keywords')

我将展示的最后一件事是API的结果

{
        "id": 2, 
        "url": "http://127.0.0.1:3004/apiimageresource/2/", 
        "image": "images/1386508612-97_img-02.JPG", 

        "keywords": [
            "birthday", 
            "cake"
        ]
    },

如您所见,关键字从字符串(它们的名称)返回为数组.我希望将它们作为键值对返回其id和值:

"keywords": [
    "1":"birthday",
    "3":"cake"
]

如果您知道如何使用我的serialallizer,我将感谢:)

Answer 1

创建自定义序列化器:

class MyKeywordsField(serializers.RelatedField):
    def to_native(self, value):
        return { str(value.pk): value.name }

用它:

class ImageResourceSerializer(serializers.HyperlinkedModelSerializer):
    keywords = MyKeywordsField(many=True)
    # ...