无法分配“<class 'django.contrib.auth.models.User'>”："Model.user" 必须是 "User" 实例

Question

创建模型的第一个条目时抛出错误

我执行了以下命令进行迁移

manage.py makemigrations
manage.py migrate

一切正常，在我执行这些命令以在数据库中创建第一个 'data' 之后

manage.py shell
from sms.models import Post
from django.contrib.auth.models import User
post_1 = Post(name="testname", email="testemail", gender="Monsieur", number="23233", author=User)

它给了我这个错误：

ValueError: Cannot assign "<class 'django.contrib.auth.models.User'>": "Post.author" must be a "User" instance.

models.py 个文件

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

THE_GENDER = [
    ("Monsieur", "Monsieur"),
    ("Madame", "Madame")
]


class Post(models.Model):


    name = models.CharField(max_length=100)
    email = models.CharField(max_length=100)
    gender = models.CharField(max_length=8, choices=THE_GENDER)
    number = models.CharField(max_length=100)
    author = models.ForeignKey(User, on_delete=models.CASCADE)

    def __str__(self):
        return self.name

Answer 1

您看到此错误是因为您试图将 class 对象分配给 author 属性。但它应该是 User 实例。所以你应该先创建用户记录并使用它，像这样：

user = User.objects.create_user(username="name", email="email@mail.com", password="Pass12345")
post_1 = Post(name="testname", email="testemail", gender="Monsieur", number="23233", author=user)

您可以将模型 class 视为数据库 table。虽然模型实例表示来自此 table.

的记录

无法分配“<class 'django.contrib.auth.models.User'>”："Model.user" 必须是 "User" 实例

Cannot assign "<class 'django.contrib.auth.models.User'>": "Model.user" must be a "User" instance

python

migration

django

django-migrations