Question

我正在尝试在序列化器的DRF创建函数中创建配置文件，但是在保存用户模型时会触发下一个异常

ValueError: "<Usuario: Some Name>" needs to have a value for field "id" before this many-to-many relationship can be used.

这是我在python 3上的配置背景的Django == 1.11 DRF == Django rest框架

class CustomUserManager(BaseUserManager):
    def _create_user(self, firstname, lastname, password, **extra_fields):
        now = timezone.now()
        if not firstname:
            raise ValueError(u'The firstname is required.')

        user = self.model(
            firstname=firstname,
            lastname=lastname,
            last_login=now,
            **extra_fields
        )
        user.set_password(password)
        user.save()

        return user

class Usuario(
    AbstractBaseUser, PermissionsMixin,
    TimeStampedModel, SoftDeletableModel
):

    objects = CustomUserManager()

class Profile(models.Model):
    user = models.OneToOneField(Usuario, related_name='profile', on_delete=models.CASCADE)

class UserSerializer(serializers.ModelSerializer):
    profile = PerfilSerializer(read_only=True)

    def create(self, validate_data):
        user_data = validate_data
        profile_data = validate_data.pop('profile')

        usr = Usuario(**user_data)
        usr.save()

        profl = Profile(**profile_data)
        profl.save()
        profl.user.set(usr)

        return usr

我想获得带有用户实例和配置文件的模型

Answer 1

仅在用户保存时使用Django Signals。

from django.contrib.auth.models import User
from django.db.models.signals import post_save
from django.dispatch import receiver

@receiver(post_save, sender=User)
def save_profile(sender, instance, **kwargs):
    instance.profile.save()

请查看此具体教程，因为它可以解决您的问题。

https://simpleisbetterthancomplex.com/tutorial/2016/07/28/how-to-create-django-signals.html

很高兴为您服务！

Answer 2

您步入正轨，只需在配置文件序列化程序上调整create。试试这个：

class UserSerializer(serializers.ModelSerializer):
    class Meta:
        model = Profile

    def create(self, validated_data):
        user = User.objects.create(**validated_data)
        Profile.objects.create(user=user)
        return user

在创建用户的同时创建配置文件

2 个答案: