Django manytomany 添加数据使用APIView实现

需求：需要真多多对多的插入插入数据操作，这个问题卡了很久。

1.Model定义

from django.db import models

class Author(models.Model):
 name = models.CharField(max_length=255, unique=True)

class Book(models.Model):
 title = models.CharField(max_length=200)
#定义多对多的关系
 author = models.ManyToManyField(Author, related_name="author_related")

2.Serializer序列化定义

from rest_framework import serializers
from .models import Author, Book

class AuthorModelSerializer(serializers.ModelSerializer):

    class Meta:
        model = Author
        fields = ("id","name")

    def create(self, validated_data):
        """
        根据提供的验证过的数据创建并返回一个新的`Author`实例。
        """
        return Author.objects.create(**validated_data)

class BookModelSerializer(serializers.ModelSerializer):

    class Meta:
        model = Book
        fields = ("id","title","author")


    #重点重点！！！
    def create(self, validated_data):
        """
        根据提供的验证过的数据创建并返回一个新的`Author`实例。
        """
        #将authors 多对多关系的数据从前端传过来的数据中取出，放在authors 中
        authors = validated_data.pop('author')
        #将正常的book的数据进行保存，创建Book实例，并通过book 接收
        book = Book.objects.create(** validated_data)
        #重点中的重点：循环读取authors对象的数据
        for author in authors:
            #实例化author对象
            author = Author.objects.filter(id=author.id).first()
            #将多对多的关系添加到book中
            book.author.add(author)
            #保存book的多对多关系
            book.save()
        return book

自己疑惑的点：

1.如果需要depth =1，需要展示成多层的嵌套的数据的样式，，多层嵌套目前我还没有找到添加的数据的方式。我能想到的思路是建两个序列化的类，一个用于插入和更新的序列化类，一个专门用于查新的序列化类。合并在一起哪位知道也可以告知一下。

2.以及需要自己定制显示多对多的关系的字段,比如设置下面的样式，都会添加报错。以及增加read_only =True也会报错。

    author = AuthorModelSerializer(many=True)
    author = serializers.PrimaryKeyRelatedField(many=True)

    author = serializers.SlugRelatedField(
        many=True,
        read_only=True,
        slug_field='author_related'
     )

3.View的编写：使用APIView

from rest_framework import status
from rest_framework.response import Response
from rest_framework.views import APIView
from books.models import Book,Author
from books.serializers import BookModelSerializer,AuthorModelSerializer
from rest_framework import viewsets

class BookList(APIView):
  def get(self, request):
    books = Book.objects.all()
    serializer = BookModelSerializer(books, many=True)
    return Response(serializer.data)
  
  def post(self, request, *args, **kwargs):
    data = request.data
    serializer = BookModelSerializer(data=data)
    if serializer.is_valid():
      serializer.save()
      return Response(serializer.data, status=status.HTTP_201_CREATED)
    return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

class AuthorList(APIView):
  def get(self, request):
    authors = Author.objects.all()
    serializer = AuthorModelSerializer(authors, many=True)
    return Response(serializer.data)

  def post(self, request):
    data = request.data
    print(data)
    serializer = AuthorModelSerializer(data=data)
    if serializer.is_valid():
      serializer.save()
      return Response(serializer.data, status=status.HTTP_201_CREATED)
    return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

4.URL配置

from django.contrib import admin
from django.urls import path,re_path,include
from books import views

urlpatterns = [
    re_path(r'^booklist/$', views.BookList.as_view()),
    re_path(r'^authorlist/$', views.AuthorList.as_view()),
]

5.Postman测试数据

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