DRF 多对多序列化和反序列化

一、序列化

查询所有的学生的信息，包括任课老师

models.py

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)
    students = models.ManyToManyField(to='Student',related_name='teacher')

serializer.py

from rest_framework import serializers
from . import models

# 老师序列化
class TeacherSerializer(serializers.ModelSerializer):
    class Meta:
        model = models.Teacher
        fields = ('id','name')
# 学生序列化
class StudentSerializer(serializers.Serializer):
        name = serializers.CharField(max_length=32)
        teacher = TeacherSerializer(many=True,read_only=True)

views.py

# 查询所有的学生对应的老师

studentobj = models.Student.objects.all()
stu = StudentSerializer(studentobj,many=True)
return Response(stu.data)

结果

[
    {
        "name": "小张",
        "teacher": [
            {
            "id": 3,
            "name": "王老师"
            }
        ]
    },
    {
        "name": "小王",
        "teacher": [
        {
            "id": 4,
            "name": "付老师"
            }
        ]
    },
    {
    "name": "小赵",
    "teacher": []
    },
    {
    "name": "小琪",
    "teacher": []
    }
]

查询所有的老师的信息，包括所教学生

models.py

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)
students = models.ManyToManyField(to='Student',related_name='teacher')

serializer.py

from rest_framework import serializers
from . import models



# 学生序列化

class StudentSerializer(serializers.ModelSerializer):
    class Meta:
        model = models.Teacher
        fields = ('id','name')


# 老师序列化

class TeacherSerializer(serializers.Serializer):
    name = serializers.CharField(max_length=32)
    students = StudentSerializer(many=True,read_only=True)

views.py

teacherobj = models.Teacher.objects.all()
teach = TeacherSerializer1(teacherobj,many=True)
return Response(teach.data)

结果

[
    {
        "name": "王老师",
        "students": []
        },
        {
        "name": "刘老师",
        "students": []
        },
    {
        "name": "郑老师",
        "students": [
            {
                "id": 1,
                "name": "小张"
            }
        ]
    },
    {
        "name": "董老师",
        "students": [
            {
            "id": 2,
            "name": "小李"
            }
        ]
    }
]

二、反序列化

老师添加学生

models.py

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)
    students = models.ManyToManyField(to='Student',related_name='teacher')

serializer.py

# 反序列化

class TeacherUnserializer(serializers.Serializer):
    id = serializers.IntegerField()
    student_id = serializers.ListField()

    def create(self,data):
        tid = data.pop('id')
        student_id = data.pop('student_id')
        teacherobj = models.Teacher.objects.filter(id=tid).first()
        teacherobj.students.set(
            student_id
        )
        return teacherobj

views.py

data = {
    "id":2,
    "student_id":[1,2,3,4]
}
obj = TeacherUnserializer(data=data)
if obj.is_valid():
    obj.save()
print(obj.errors)
return Response('ok')

学生添加老师

models.py

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)
    students = models.ManyToManyField(to='Student',related_name='teacher')

serializer.py

# 反序列化

class StudentUnserializer(serializers.Serializer):
    id = serializers.IntegerField()
    teacher_id = serializers.ListField()

    def create(self,data):
        id = data.pop('id')
        teacher_id = data.pop('teacher_id')
        studentobj = models.Student.objects.filter(id=id).first()
        studentobj.teacher.set(
            teacher_id
        )
        return studentobj

views.py

data = {
    "id": 2,
    "teacher_id": [1, 2, 3, 4]
}
obj = StudentUnserializer(data=data)
if obj.is_valid():
    obj.save()
print(obj.errors)
return Response('ok')