访问user Model的三种方式

一、最常规，不定制custom的方式

from django.contrib.auth.models import User

class Post(models.Model):
    author = models.ForeignKey(User, on_delete=models.CASCADE)
    title = models.CharField(max_length=50)
    body = models.TextField()

二、custom user

# settings.py
AUTH_USER_MODEL = `users.CustomUser`

然后在model这样写

from django.conf import settings
from django.db import models

class Post(models.Model):
    author = models.ForeignKey(
      settings.AUTH_USER_MODEL,
      on_delete=models.CASCADE
    )
    title = models.CharField(max_length=50)
    body = models.TextField()

三、不管是不是定制，通用的写法：get_user_model

# settings.py
AUTH_USER_MODEL = `users.CustomUser`

model.py这样写

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

class Post(models.Model):
    author = models.ForeignKey(
      get_user_model(),
      on_delete=models.CASCADE
    )
    title = models.CharField(max_length=50)
    body = models.TextField()

get_user_model()会返回当前使用的用户，不论是定制还是系统默认用户。AUTH_USER_MODEL只针对定制用户。