python - 名称错误 : name 'Usuario' is not defined

Question

当我尝试执行“makemigrations”时，我在 django 中遇到了这个错误

代码:

from django.db import models
from django.contrib.auth.models import User

# Create your models here.

class Usuario(models.Model):
    user = models.OneToOneField(User)
    amigos = models.ManyToManyField(Amigo)



class Amigo(models.Model):  
    usuarios = models.ForeignKey(Usuario)



class Regalo(models.Model):
    nombre = models.CharField(max_length=100)
    enlace_compra = models.CharField(max_length=200)
    amigo_encargado = models.OneToOneField(User)

对不起，我的英语很差，我用的是翻译。

Answer 1

Amigo类在声明Usuario类时没有定义，所以不能在amigos字段中使用。

来自 django 文档:

If you need to create a relationship on a model that has not yet been defined, you can use the name of the model, rather than the model object itself

在 Usuario 类中更改这一行:

amigos = models.ManyToManyField(Amigo)

到:

amigos = models.ManyToManyField('Amigo')