Python 为什么跟随者计数在django上不起作用

我一直在尝试在django上实现一个follow/unfollow系统，其中用户可以跟随其他用户，也可以跟随该用户，在用户的个人资料中，有一个following count，它显示用户正在跟踪多少人，还有一个following count，它应该显示用户有多少追随者，就像在instagram中一样。除了不计算跟随者的跟随者计数之外，一切都正常。为了进行跟随者计数，我使用了信号，但它不起作用。我如何解决这个问题

models.py

class Profile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    profile_pic = models.ImageField(upload_to='profile_pics', null=True, blank=True, default='default.png')
    bio = models.CharField(max_length=400, default=1, null=True)
    connection = models.CharField(max_length = 100, blank=True)
    follower = models.IntegerField(default=0)
    following = models.IntegerField(default=0)

    def __str__(self):
        return f'{self.user.username} Profile'

class Following(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    followed = models.ManyToManyField(User, related_name="followed")
    follower = models.ManyToManyField(User, related_name="follower")

    @classmethod
    def follow(cls, user, another_account):
        obj, create = cls.objects.get_or_create(user = user)
        obj.followed.add(another_account)
        print("followed")

    @classmethod
    def unfollow(cls, user, another_account):
        obj, create = cls.objects.get_or_create(user = user)
        obj.followed.remove(another_account)
        print("unfollowed")

    def __str__(self):
        return f'{self.user.username} Profile'

views.py

def profile(request, username=None):
    profile, created = Profile.objects.get_or_create(user=request.user)
    if username:
        post_owner = get_object_or_404(User, username=username)
        profile_bio = Profile.objects.filter(user_id=post_owner)
        user_posts = Post.objects.filter(user_id=post_owner)
        user = User.objects.get(username=username)
        is_following = Following.objects.filter(user=request.user, followed=user)
        following_obj = Following.objects.get(user=user)
        follower = following_obj.follower.count()
        following = following_obj.followed.count()

    else:
        post_owner = request.user
        user_posts = Post.objects.filter(user=request.user)
        profile_bio = Profile.objetcs.filter(user=request.user)
        
    args1 = {
        'post_owner': post_owner,
        'user_posts': user_posts,
        'follower': follower,
        'following': following,
        'connection': is_following,
        'profile_bio': profile_bio,
    }
    return render(request, 'profile.html', args1)

def follow(request, username):
    main_user = request.user
    to_follow = User.objects.get(username=username)
    following = Following.objects.filter(user = main_user, followed = to_follow)
    is_following = True if following else False 


    if is_following:
        Following.unfollow(main_user, to_follow)
        is_following = False
    else:
        Following.follow(main_user, to_follow)
        is_following = True
    resp = {
        'following': is_following,
    }

    response = json.dumps(resp)
    return HttpResponse(response, content_type="application/json")

signals.py

@receiver(m2m_changed, sender = Following.followed.through) # which list is changed
def add_follower(sender, instance, action, reverse, pk_set, **kwargs):
    followed_users = [] # list of users main (logged ) user have followed
    logged_user = User.objects.get(username = instance) # user who followed other users
    for i in pk_set:
        user = User.objects.get(pk = i)
        following_obj = Following.objects.get(user = user)
        followed_users.append(following_obj)

    if action == "pre_add":
        for i in followed_users:
            i.follower.add(logged_user)
            i.save()

    if action == "pre_remove":
        for i in followed_users:
            i.follower.remove(logged_user)
            i.save()

profile.html

{% if connection and not request.user == post_owner %}
  <a type="button" class="button-caballo" id="follow" role="button" href="{% url 'follow' post_owner.username %}">Unfollow</a>
{% elif not connection and not request.user == post_owner %}
  <a type="button" class="button-caballo" id="follow" role="button" href="{% url 'follow' post_owner.username %}">Follow</a>
{% endif %}
<div class="header-item">
  {{follower}}
</div>
<div class="header-item">
  {{following}}
</div>

{%if连接而不是请求。user==post_owner%}
{%elif not connection and not request.user==post_owner%}
{%endif%}
{{follower}}
{{following}

为什么要为追随者创建另一个字段？您可以从下表中获得追随者数量和用户，而不需要任何追随者字段

以下模型应仅包含用户，然后 您可以使用

following.objects.filter(followed=request.user)

---

嘿，伊萨姆！我刚刚尝试用

follower=following.objects.filter（followind=request.user）

更改

follower=following\u obj.follower.count（）

，并将其添加到html

{follower.count}

。另外，我从下面的模型中删除了followers字段，它仍然不起作用。我做错了什么？你得到的结果是0还是null或其他什么，请问是什么错误？嘿，我意识到错误是django无法识别signals.py文件，所以现在我修复了这个问题，但是没有得到下面的计数，而是按钮不起作用。“跟随”按钮未跟随用户。如何解决这个问题。确保请求的用户具有追随者2。尝试将以下类（后跟字段）中的关系从ManyToManyField替换为一对OneToOneField使用OneToOneField时，signals.py上出现错误，@receiver（m2m\u已更改，sender=following.following.through）中第8行的

文件“C:\Users\USER\startup\gstartup\accounts\signals.py”#哪个列表更改了AttributeError:“ForwardOneToOneDescriptor”对象没有“通过”属性