Django :如何根据最新帖子查询用户

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

class Post(models.Model):
    title = models.CharField(max_length=100)
    content = models.TextField()
    created_at = models.DateTimeField(auto_now_add=True)
    author = models.ForeignKey(User, on_delete=models.CASCADE)

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

def get_latest_post_author():
    latest_post = Post.objects.order_by('-created_at').first()
    if latest_post:
        return latest_post.author
    else:
        return None