django restframework 多对多模型

1。模型 图书和作者是多对多关系

class Book(models.Model):
    book_name=models.CharField(max_length=40)
    price=models.DecimalField(max_digits=4,decimal_places=2)
    publish=models.ForeignKey(to="Publish",on_delete=models.CASCADE,related_name="publish")
    author=models.ManyToManyField(to="Author",related_name="author")

    class Meta:
        db_table="tbl_book"

    # def __str__(self):
    #     return self.book_name

class Publish(models.Model):
    publish_name=models.CharField(max_length=20)
    address=models.CharField(max_length=30)

    class Meta:
        db_table="tbl_publish"
    # def __str__(self):
    #     return self.publish_name

class Author(models.Model):
    sex_choices=[(0,"男"),(1,"女")]
    name=models.CharField(max_length=20,unique=True)
    phone=models.BigIntegerField()
    sex=models.IntegerField(choices=sex_choices)

    class Meta:
        db_table="tbl_author"

    # def __str__(self):
    #     return self.name

　

序列化器：

class SerBook(serializers.ModelSerializer):
    """  add(1) add(1,2), set(list_object), remove(1), remove(1,2) or remove(*[1,2])"""
    #publish = serializers.PrimaryKeyRelatedField(queryset=Publish.objects.all())
    #author = serializers.PrimaryKeyRelatedField(allow_empty=False, many=True, queryset=Author.objects.all())
    class Meta:
        model=Book
        fields="__all__"


class  SerPublish(serializers.ModelSerializer):
    class Meta:
        model = Publish
        fields = "__all__"

class  SerAuthor(serializers.ModelSerializer):
    class Meta:
        model = Author
        fields = "__all__"

　

视图以图书为例：

class BookView(APIView):


    def get(self,request,*args,**kwargs):

        pk= kwargs.get("id")
        if pk :
            inst = Book.objects.filter(id=kwargs.get("id")).first()
            if inst:
                ser = SerBook(instance=inst, many=False)
                return Response(data=ser.data, status=200)
            else:
                return Response(data={"msg": "not found", "data": []}, status=200)
        else:
            inst = Book.objects.all()
            ser = SerBook(instance=inst, many=True)
            return Response(data=ser.data, status=200)


    def post(self,request,*args,**kwargs):
        data=request.data
        many=False
        if isinstance(data,list):
          many=True
        ser = SerBook(data=data, many=many)
        if ser.is_valid():
            ser.save()
            return Response(data=ser.data, status=status.HTTP_200_OK)
        else:
            return Response(data=ser.errors, status=status.HTTP_404_NOT_FOUND)


    def put(self,request,*args,**kwargs):
         data=request.data
         pk=kwargs.get("id")
         if pk :
            inst=Book.objects.filter(id=pk).first()
            print(Book.objects.filter(id=pk).values().first(),"xxxx")
            if inst:
                ser = SerBook(instance=inst, many=False,data=data
                              )
                if ser.is_valid():
                    ser.save()
                return Response(data=ser.data, status=200)
　　

　

 序列化器结构：

postman测试：

创建单个图书:

PUT  修改图书根据图书book  id：

多对多删除：

    def delete(self,request,*args,**kwargs):
        pk= kwargs.get("id")
        data=request.data
        if pk:
            inst=Book.objects.filter(id=pk).first()
            if inst:
                inst.delete()
                return Response(data={"code":200,"msg":"删除ok"})
            else: return Response(data={"code":404,"msg":"删除失败,不存在!"})
        else:
            ids=data.get("ids")
            if isinstance(ids,list):
                objs=Book.objects.filter(id__in=ids)
                objs.delete()
                return Response(data={"code":200,"msg":"删除ok"})

　批量删除：