多对多反序列化案例

创建一个经典的多对多关系:一个学生可以有多个老师，一个老师可以有个学生

from django.db import models

# 学生类
class Student(models.Model):
    name = models.CharField(max_length=32)

    # 老师类
class Teacher(models.Model):
    name = models.CharField(max_length=32)
    stu = models.ManyToManyField(to='Student',related_name='teacher')

进行数据迁移

python manage.py makemigrations
python manage.py migrate

查看表结构
- app04_student 学生表
- app04_teacher 老师表
- app04_teacher_stu 中间表

创建序列化文件

from rest_framework import serializers
from . import models
# 反序列化
class TeacherUnserializer(serializers.Serializer):
    # required = False 可以传值，也可以不传值
    id = serializers.IntegerField(required=False)
    student_id = serializers.ListField()

    # 添加
    def create(self,data):
        # 获取老师的id
        tid = data.pop('id')
        # 获取学生的id
        student_id = data.pop('student_id')
        # 获取老师的实例
        teacherobj = models.Teacher.objects.filter(id=tid).first()
        # 添加数据
        teacherobj.students.set(
            student_id
        )
        # 返回老师的实例
        return teacherobj

    # 更新
    def update(self, instance, validated_data):
        # 获取学生的id列表
        student_id = validated_data.get('student_id')
        # 更新数据
        instance.students.set(student_id)
        # 返回实例
        return instance

视图 views.py

from rest_framework.views import APIView
from rest_framework.response import Response
from .seriliazers import *
from . import models
class TeacherView(APIView):

    # 添加关系
    def post(self,request):
        data = request.data
        obj = TeacherUnserializer(data=data)
        if obj.is_valid():
            obj.save()
            return Response({
                "status":200
            })
        return Response({
            "status": 201
        })
    # 编辑关系
    def put(self,request):
        data = request.data
        tid = data.pop('id')
        print(tid)
        teacherobj = models.Teacher.objects.filter(id=tid).first()
        print(teacherobj)
        obj = TeacherUnserializer(instance=teacherobj,data=data)
        if obj.is_valid():
            obj.save()
            return Response({
                'status':200,
                'msg':'',
            })
        return Response({
            'status': 201,
            'msg': '',
        })

提供的数据结构

添加的数据结构

{
    "id":2,
    "student_id":[1,2,3]
}

编辑的数据结构

{
    "id":2,
    "student_id":[1,2,3]
}

17.3.1 多对多反序列化案例

多对多反序列化案例

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