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博客五部曲之三 - 博客RESTful

21 创建评论序列化函数 3

创建评论序列化函数 3

时间创建API视图，跟前面直接指定serializer_class不同，本节用get_serializer_class函数来冬天获取序列化类，另一种方式是在序列化类里调用perform_create函数（待确认）

comments/api/views.py

class CommentCreateAPIView(CreateAPIView):
    queryset = Comment.objects.all()
    #serializer_class = PostCreateUpdateSerializer
    permission_classes = [IsAuthenticated]
    def get_serializer_class(self):
        model_type = self.request.GET.get("type")
        slug = self.request.GET.get("slug")
        parent_id = self.request.GET.get("parent_id", None)
        return create_comment_serializer(
                model_type=model_type, 
                slug=slug, 
                parent_id=parent_id,
                user=self.request.user
                )

添加URL

urlpatterns = [
    url(r'^create/$', CommentCreateAPIView.as_view(), name='create'),
]

修改create_comment_serializer函数，将用户信息传递进去

def create_comment_serializer(model_type='post', slug=None, parent_id=None, user=None):
    class CommentCreateSerializer(ModelSerializer):
        def create(self, validated_data):
            content = validated_data.get("content")
            if user:
                main_user = user
            else:
                main_user = User.objects.all().first()
            model_type = self.model_type
            slug = self.slug
            parent_obj = self.parent_obj
            comment = Comment.objects.create_by_model_type(
                    model_type, slug, content, main_user,
                    parent_obj=parent_obj,
                    )
            return comment
    return CommentCreateSerializer

使用api创建评论 http://127.0.0.1:8000/api/comments/create/

有的时候会报下面错误，因为代码里设定了permission_classes = [IsAuthenticated]，所以记得登陆授权一下

Comment Create Api
GET /api/comments/create/
HTTP 403 Forbidden
Allow: POST, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "detail": "Authentication credentials were not provided."
}

另外，由于创建时我们要获取type和slug信息，所以需要通过GET传递进去，否则报错
http://127.0.0.1:8000/api/comments/create/?type=post&slug=test

再次执行

POST /api/comments/create/?type=post&slug=test
HTTP 201 Created
Allow: POST, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "id": 51,
    "parent": null,
    "content": "this is comment",
    "timestamp": "2018-07-18T13:50:18.078000Z"
}

查看 http://127.0.0.1:8000/test，新的comments已生成。

如果我们想恢复id=51的comments，可以用http://127.0.0.1:8000/api/comments/create/?type=post&slug=test&parent_id=51，添加新的参数这样http://127.0.0.1:8000/comments/51下面就可以看到新的嵌套评论了

因为可以通过GET parent_id获取参数，我们可以把parent从Serializer里面去掉先