QuerySet返回空

Question

我正在建立一个网站，用户可以关注某些股票，并根据他们关注的股票查看文章

models.py：

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

class Stock(models.Model):
    name = models.CharField(max_length = 50)
    ticker = models.CharField(max_length = 50)

    def __str__(self):
        return self.name

class Profile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    followed_stocks = models.ManyToManyField(Stock, blank=True)

    def __str__(self):
        return self.user.first_name

class Article(models.Model):
    stock = models.ForeignKey(Stock, on_delete=models.CASCADE, default = 0 )
    title = models.CharField(max_length = 200)
    url = models.URLField()
    description = models.TextField()

    def __str__(self):
        return self.title

views.py：

from django.shortcuts import render
from .models import Article

def index(request):
    stocks_user_follows = request.user.profile.followed_stocks.all()
    articles_to_display = Article.objects.filter(stock__in=stocks_user_follows) #where the problem lies

    return render(request, 'core/index.html', {'stocks_user_follows':stocks_user_follows, 'articles_to_display':articles_to_display})

stocks_user_follows = request.user.profile.followed_stocks.all()返回正确的值，但是当我在index.html中打印{{articles_to_display}}时，QuerySet中没有任何内容，这意味着我必须做错事。提前谢谢！