django：使用 Jinja if 语句在模板上显示锚链接

Question

我在 Django 中创建了一个好友系统。我为每个用户创建了一个配置文件模型，它有一个朋友字段。我还创建了一个friendrequest 模型来发送和接收请求。一切正常。在每个用户的个人资料（模型）上，我可以看到三个选项：添加朋友、删除朋友和取消请求。但是，如果我所在的个人资料的用户不是我的朋友，我只想显示添加朋友链接。删除好友和取消请求也是如此（如果 FriendRequest 对象存在则显示取消请求）。我试图检查我所在个人资料的用户是否是我的朋友，如果是，则个人资料应显示删除朋友选项，但该操作不起作用。这是我的代码：

我的models.py：

class profile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE, related_name='profile')
    desc = models.TextField(null=True)
    pfp = models.ImageField(default='social_media/images/profile.jpg', upload_to='profile_pics/', null=True, blank=True)
    cover = models.ImageField(default='social_media/images/cover.jpg', upload_to='cover_pics/', null=True, blank=True)
    occupation = models.CharField(max_length=250, default='')
    friend = models.ManyToManyField(User, blank=True, null=True, related_name='friended')

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

class FriendRequest(models.Model):
    to_user = models.ForeignKey(User, related_name='to_user', on_delete=models.CASCADE)
    from_user = models.ForeignKey(User, related_name='from_user', on_delete=models.CASCADE)
    timestamp = models.DateTimeField(auto_now_add=True) # set when created

    def __str__(self):
        return "From {}, to {}".format(self.from_user.username, self.to_user.username)

我的个人资料显示视图：

@login_required
def userprofile(request, user_id=None):
    button_status = 'none'
    user = get_object_or_404(User, id=user_id)
    if user in request.user.friended.all():
        button_status = 'not_friend'
    if user:
        user = User.objects.get(id=user_id)
        Post = post.objects.order_by('-created')
        return render(request,'social_media/profile.html', {'Post':Post,'User':user})

@login_required
def send_request(request,id):
    from_user=request.user
    to_user=User.objects.get(id=id)
    freq=FriendRequest.objects.get_or_create(from_user=from_user,to_user=to_user)
    return redirect(request.META['HTTP_REFERER'])

@login_required
def remove_friend(request,id):
    user1=request.user
    user2=User.objects.get(id=id)
    user1.profile.friend.remove(user2)
    user2.profile.friend.remove(user1)
    return redirect(request.META['HTTP_REFERER'])

@login_required
def accept_request(request,id):
    freq=FriendRequest.objects.get(id=id)
    user1=request.user
    user2=freq.from_user
    user1.profile.friend.add(user2)
    user2.profile.friend.add(user1)
    freq.delete()
    return redirect(request.META['HTTP_REFERER'])

我的个人资料模板：

                  <div class="right_details_user">
                        <div class="profile_status">
                              <div>Status: {{ User.status.status }}</div>
                        </div>
                        {% if not user.username == User.username %}
                        {% if button_status == 'not_friend' %}
                        <a href="{% url 'add-friend' User.id %}">Add Friend</a>
                        <br>
                        {% else %}
                        <a href="{% url 'remove-friend' User.id %}">Remove Friend</a>
                        <br>
                        {% endif %}
                        <a href="{% url 'cancel-request' User.id %}">Cancel Request</a>
                        <br>                        
                        {% endif %}
                        {{ User.friended.all }}
                  </div>

Answer 1

你可以在你的模板中这样检查。

{% if not User in request.user.friended.all %}
    <a href="{% url 'add-friend' User.id %}">Add Friend</a>
      <br>
   {% else %}
 <a href="{% url 'remove-friend' User.id %}">Remove Friend</a>
 <br>
 {% endif %}

编辑：

您可以像这样检查发送的请求。

def userprofile(request, user_id=None):
     user = User.objects.get(id=user_id)
     Post = post.objects.order_by('-created')
     sent_request = FriendRequest.objects.filter(from_user=request.user, to_user=user)
     return render(request,'social_media/profile.html', {'Post':Post,'User':user, 'sent_request':sent_request})

现在在模板中。

{% if sent_request and not User in request.user.friended.all %}
  <a href="{% url 'cancel-request' User.id %}">Cancel Request</a>
{% endif %}