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博客五部曲之三 - 博客RESTful

24 Comment URLs & Post Get API URLs

Comment URLs & Post Get API URLs

在ListView里面，字段大多以数字形式显示，这一节我们会让这些内容更直接一些，显示为有意义的值或者超链接到具体对象。

修改方法跟post类似

首先在ListView里添加到DetailView的超链接

添加url为HyperlinkedIdentityField，并将这个url添加到fields。
注释掉三个field，这些我们可以在DetailView直接查看

class CommentListSerializer(serializers.ModelSerializer):
    url = HyperlinkedIdentityField(view_name='comments-api:thread')
    class Meta:
        model = Comment
        fields = [            
            "url",
            "id",
            # "content_type",
            # "object_id",
            # "parent",
            "content",
            "reply_count"
        ]

在DetailView里面，显示post的具体的路径。方法是通过SerializerMethodField。
同样注释掉content_type和content_id，这个可以反映在content_object_url里。

class CommentDetailSerializer(serializers.ModelSerializer):
    reply_count = SerializerMethodField()
    content_object_url = SerializerMethodField()
    replies = SerializerMethodField()
    class Meta:
        model = Comment
        fields = [
            "id",
            # "content_type",
            # "object_id",
            "content",
            "reply_count",
            "replies",
            "timestamp",
            "content_object_url"
        ]
        read_only_fields = [
            # "content_type",
            # "object_id",            
            "reply_count",
            "replies",
        ]
    def get_content_object_url(self, obj):
        try:
            return obj.content_object.get_api_url()
        except:
            return None

效果如下
ListView

GET /api/comments/
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

[
    {
        "url": "[http://127.0.0.1](http://127.0.0.1):8000/api/comments/53",
        "id": 53,
        "content": "reply ++",
        "reply_count": 1
    },
    {

DetailView

GET /api/comments/53
HTTP 200 OK
Allow: GET, PUT, DELETE, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "id": 53,
    "content": "reply ++",
    "reply_count": 1,
    "replies": [
        {
            "id": 54,
            "content": "123",
            "timestamp": "2018-07-18T13:57:07.555000Z"
        }
    ],
    "timestamp": "2018-07-18T13:56:27.753000Z",
    "content_object_url": "/api/posts/test/"
}