django rest framework 多对多数据报错

1.Model定义

from django.db import models
from datetime import datetime
#引入系统用户的分类
from django.contrib.auth.models import AbstractUser
class Role(models.Model):
    """
    角色表
    """
    role_name = models.CharField(max_length=30, unique=True, verbose_name="角色名")
    create_time = models.DateTimeField(default=datetime.now, verbose_name="添加时间")
    role_desc = models.TextField(max_length=100, verbose_name="角色描述")
    role_parent_id = models.IntegerField(default=0, verbose_name="父级角色id")
    update_time = models.DateTimeField(default=datetime.now, verbose_name="更新时间")

    class Meta:
        verbose_name = "角色"
        verbose_name_plural = verbose_name

    def __str__(self):
        return self.role_name

#userProfile继承AbstractUser分类，进行拓展
class UserProfile(AbstractUser):
    """
    用户类拓展
    """
    name = models.CharField(max_length=30, verbose_name="姓名" )
    avatar = models.CharField(max_length=100, null=True, blank=True, verbose_name="头像")
    role = models.ManyToManyField(Role, verbose_name="角色", related_name='role', )

    class Meta:
        verbose_name = "用户"
        verbose_name_plural = verbose_name

    def __str__(self):
        return self.username

2.Serializer 定义：

# -*- coding: UTF-8 -*-
from django.contrib.auth import get_user_model
from users.models import Role
from rest_framework import serializers
User = get_user_model()


class UserDetailSerializer(serializers.ModelSerializer):
    """
    用户详情序列表类
    """
    role = serializers.SlugRelatedField(
        many=True,
        read_only=True,
        slug_field='role_name'
     )
    class Meta:
        model = User
        fields = ("id", "username", "name", "role", "avatar")
        depth = 1


    def create(self, validated_data):
         print( validated_data)
         role_data = validated_data.pop["role"]
         # print(role_data)
         user = super(UserDetailSerializer, self).create(validated_data= validated_data)
         user.set_password(validated_data["password"])
         user.save()
         for role in role_data:
             user.role.create(user=user, **role)
         return user

3.View定义

User = get_user_model()

class UserViewset(CreateModelMixin, mixins.UpdateModelMixin, mixins.RetrieveModelMixin, viewsets.GenericViewSet):
    """
    用户
    """
    serializer_class = UserDetailSerializer
    queryset = User.objects.all()

4#URL定义

router = DefaultRouter()
router.register(r'api/users', UserViewset, base_name="users")

Postman

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