ForeignKey到Model字段？

Question

我希望foreign key我的模型中的关系与表中的username字段User(存储user创建的django.contrib.auth.forms.UserCreationForm).

我的模型看起来如何:

class Blog(models.Model):
    username = models.CharField(max_length=200) // this should be a foreign key
    blog_title = models.CharField(max_length=200)
    blog_content = models.TextField()

该username字段应该是外键.外键应该在此字段中

Answer 1

除非我遗漏了某些内容,否则您可以将ForeignKey用于特定字段:

class Blog(models.Model):
    username = models.ForeignKey(User, to_field='username')

https://docs.djangoproject.com/en/1.11/ref/models/fields/#django.db.models.ForeignKey.to_field

Answer 2

你不能有一个ForeignKey到一个字段,但你可以连续.

您想要username通过User模型获得哪些

所以:

blog.user.username

如果你坚持让blog.username你可以定义这样的属性:

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

class Blog(models.Model):
    user = models.ForeignKey(User)

然后访问您想要使用的字段:

blog.user.username

如果你坚持让blog.username你可以定义这样的属性:

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

class Blog(models.Model):
    user = models.ForeignKey(User)

    @property
    def username(self):
        return self.user.username

与该属性,您可以访问username通过blog.username.

关于如何导入用户的注意事项

user = ForeignKey('auth.User')

要么

from django.contrib.auth.models import User
user = ForeignKey(User)

或者更推荐

from django.conf import settings
user = ForeignKey(settings.AUTH_USER_MODEL)