如何在 django 上获得追随者

Question

我一直在开发类似 instagram 的关注系统，在该系统中，用户可以关注和取消关注其他用户，个人资料还必须显示所选用户拥有的关注者数量以及该用户关注的人数。一切正常，除了关注者计数没有显示任何数字而不是 0，这是默认值，即使用户有一个或多个关注者。这个django项目怎么添加count函数？

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)
    user = User.objects.filter(username=username)
    if user:
        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[0]
        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 = {
        'user_obj':user,
        '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")

profile.html

<div class="header-item">
  {{ follower }}
</div>
<div class="header-item">
  {{ following }}
</div>

{% if connection %}
  <a type="button" class="button-caballo" id="follow" role="button" href="{% url 'follow' user_obj.username %}">Unfollow</a>
{% elif not connection %}
  <a type="button" class="button-caballo" id="follow" role="button" href="{% url 'follow' user_obj.username %}">Follow</a>
{% endif %}

Answer 1

你必须像这样改变跟随功能：

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).first()
 
    if following is not None:
        Following.unfollow(main_user, to_follow)
        is_following = False
        main_user.following -= 1
        to_follow.follower -= 1
    else:
        Following.follow(main_user, to_follow)
        is_following = True
        main_user.following += 1
        to_follow.follower += 1

    main_user.save()
    to_follow.save()

    resp = {
        'following': is_following,
    }
    response = json.dumps(resp)
    return HttpResponse(response, content_type="application/json")