先上models.py文件内容

from django.db import models# 作者表class Author(models.Model):    nid = models.AutoField(primary_key=True)    name = models.CharField(max_length=32)    age = models.IntegerField()    def __str__(self):        return self.name# 出版社class Publish(models.Model):    nid = models.AutoField(primary_key=True)    name = models.CharField(max_length=32)    city = models.CharField(max_length=32)    email = models.EmailField()    def __str__(self):        return self.name# 图书列表class Book(models.Model):    nid = models.AutoField(primary_key=True)    title = models.CharField(max_length=32)    price = models.DecimalField(max_digits=15, decimal_places=2)    # 外键字段    publish = models.ForeignKey(to="Publish", related_name="book", related_query_name="book_query",                                on_delete=models.CASCADE)    # 多对多字段    authors = models.ManyToManyField(to="Author")

urls.py文件

from django.urls import re_pathfrom xfzapp import viewsfrom xfzapp import views2urlpatterns = [    # 第一步 设置url    re_path(r'books/$', views.BookView.as_view()),    re_path(r'books/(?P
     
      \d+)/$', views.BookFilterView.as_view()),]
     

views.py视图文件

# python内置import jsonfrom django.shortcuts import render, HttpResponsefrom rest_framework.response import Responsefrom rest_framework.views import APIViewfrom .models import Course, Book, Author, Publishfrom .xfz_serializers import BookSerializerclass BookView(APIView):    def get(self, request):        # 获取queryset,
     
      , 
      
       , ... ]>        origin_data = Book.objects.all()        # 开始序列化        serialized_data = BookSerializer(origin_data, many=True)        # 将序列化后的数据, 响应给客户端        return Response(serialized_data.data)    def post(self, request):        # 序列化验证,需要导入自定义的序列化类BookSerializer        verified_data = BookSerializer(data=request.data)        # 验证通过        if verified_data.is_valid():            book = verified_data.save()            # 传参的时候要传作者id,不要传作者名字            authors = Author.objects.filter(nid__in=request.data['authors'])            # 给书添加作者信息            book.authors.add(*authors)            return Response(verified_data.data)        # 验证不通过        else:            return Response(verified_data.errors)class BookFilterView(APIView):    # 继承APIView是因为所有的都是基于它    def get(self, request, nid):        book_obj = Book.objects.get(pk=nid)        serialized_data = BookSerializer(book_obj, many=False)        return Response(serialized_data.data)    def delete(self, request, nid):        book_obj = Book.objects.get(pk=nid).delete()        return Response(book_obj)    def put(self, request, nid):        book_obj = Book.objects.get(pk=nid)        verified_data = BookSerializer(data=request.data, instance=book_obj)        if verified_data.is_valid():            verified_data.save()            return Response(verified_data.data)        else:            return Response(verified_data.errors)
      
     

序列化文件xfz_serializers.py

# 导入模块from rest_framework import serializersfrom .models import Bookclass BookSerializer(serializers.ModelSerializer):    class Meta:        model = Book        fields = ('title',                  'price',                  'publish',                  'authors',                  'publish_name',                  'publish_city'                  )        extra_kwargs = {            'publish_id': {
   'write_only': True},            'authors_id': {
   'write_only': True}        }    publish_name = serializers.CharField(max_length=32, read_only=True, source='publish.name')    publish_city = serializers.CharField(max_length=32, read_only=True, source='publish.city')    authors = serializers.SerializerMethodField()    # "get_"是固定格式,"get_"后面部分与author_list保持一致,不能随便写    def get_authors(self, book_obj):        # 拿到queryset开始循环 [{}, {}, {}, {}]        author_list = list()        for author in book_obj.authors.all():            author_list.append(author.name)        return author_list

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