Question

我正在使用Django 2.2和PostgreSql。我正在尝试创建一个想要跟踪邻居用户的简单应用。 “关注”按钮将增加关注的数量，“关注”按钮将减少关注的数量。但是，“关注”按钮不起作用。我该如何解决这个问题？

following / models.py

class Following(models.Model):
    follower = models.ForeignKey(User, on_delete=models.CASCADE, related_name='fallower', null=True)
    followed = models.ForeignKey(User, on_delete=models.CASCADE, null=True, related_name='fallowing')

following / views.py

def user_follow_unfollow(request):
    response = sub_user_follow_unfollow(request)
    data = response.get('data')
    followed = response.get('followed')
    numbers_followed_and_follower= Following.user_followed_and_follower(followed)
    context = {'user': followed, 'followers': numbers_followed_and_follower['followers'],
           'followeds': numbers_followed_and_follower['followeds']}
    html = render_to_string('following/following_partion.html', context=context, request=request)
    data.update({'html': html})
    return JsonResponse(data=data)

def sub_user_follow_unfollow(request):
    if not request.is_ajax():
        return HttpResponseBadRequest()

    data = {'follow status': True, 'html': '', 'is_valid': True, 'msg': '<b>Unfollow</b>'}
    follower_username = request.GET.get('follower_username', None)
    followed_username = request.GET.get('followed_username', None)

    follower = get_object_or_404(User, username=follower_username)
    followed = get_object_or_404(User, username=followed_username)

    does_follow_the_user= Following.user_does_follow_the_user(follower=follower, followed=followed)

    if not does_follow_the_user:
        Following.user_follow(follower=follower, followed=followed)
    else:
        Following.user_unfollow(followed=followed, follower=follower)
        data.update({'msg': '<b>Follow</b>', 'follow_status': False})
    return {'data': data, 'followed': followed}

templates.following_partion.html

      {% if request.neighbor_detail != user %}
          <div>
              <button followed='{{ neighbor_detail.username }}' followed='{{ request.neighbor_detail.username }}'
                      url="{% url 'following:user_follow_and_unfollow' %}" id="follow_unfollow_button"
                      class="btn btn-lg btn-success">
                  {% if does_follow_the_user%}
                      <b>Unfollow</b>
                  {% else %}
                      <b>Follow</b>
                  {% endif %}
              </button>
          </div>
      {% endif %}


   <div class="followers col-lg-offset-3 col-md-3 col-md-offset-3 col-lg-3 text-center">
<span><b>followers</b></span>
<button url="{% url 'following:fallowed-or-fallowers-list' 'fallowers' %}" follow_type="followers"
        username="{{ neighbor_detail.username }}" class="follow_button btn-block btn btn-primary">
    {{ followers}}
</button>

  <div class="followeds col-lg-3 col-md-3 text-center">
<span><b>Followeds</b></span>
<button url="{% url 'following:followed-or-followers-list' 'followed' %}" follow_type="followed"
        username="{{ neighbor_detail.username }}" class="follow_button btn-block btn btn-success">
    {{ followeds}}
</button>

我的脚本

 <script>
 $("#follow_unfollow_button").click(function () {
               var $this = $(this);
               var $url = $this.attr('url');
               var $takip_eden = $this.attr('follower');
               var $takip_edilen = $this.attr('followed');
               var data = {follower_username: $follower, followed_username: $followed};
               $.ajax({
                   url: $url,
                   type: 'GET',
                   dataType: 'json',
                   data: data,
                   success: function (data) {
                       if (data.is_valid) {
                           $this.html(data.msg);
                           $("#user_following").html(data.html)
                       }
                   }
               })
           });
</script>

Answer 1

我们缺少帮助，因为丢失的件太多了。但是，调试起来应该不太困难，这是您应该检查的一些内容：

在浏览器开发人员工具中，检查HTTP请求（XHR请求）。正在发送什么参数？
在您的python调试器中，检查request.GET，data，numbers_followed_and_follower的值。如果您不知道这些，就不可能说出问题所在。
如果仍然不清楚问题出在哪里，请在python IDE中，在视图中设置一个断点，并逐行检查代码，检查结果。我不能强调使用带有适当调试器的IDE的重要性。
在浏览器开发人员工具中，检查对AJAX请求的HTTP响应。返回什么？

您需要分步分析各种变量以了解问题所在。

建议

由于您正在修改数据库，因此您应该在AJAX调用中真正使用POST（而不是GET）。

使用ManyToManyField注册关注者。它们只是两个用户之间的关系：

follows = models.ManyToManyField("self", symmetrical=False, related_name="followers")

通过指定symmetrical=False，您告诉Django区分关系的两个方向。为了在视图中创建或删除关系以及查看关系，您可以：

user.follows.add(other_user)  # user follows other_user
user.follows.remove(other_user)  # user unfollows other_user
user.followers.all()  # people following
user.followers.count()  # number of followers

为什么Django上的“关注”按钮不起作用？

1 个答案: