DoesNotExist at /profiles/user-profile/ UserProfile 匹配查询不存在

Question

我正在尝试添加跟随切换，但在我看来，我在匹配查询集时遇到错误。用户配置文件存在于数据库中，但我仍然不知道它为什么会发生。我希望你能猜出我的错误并告诉我如何解决它。如果你帮助我，我正在学习 django，这意味着很多。我会感谢你的。如果需要的帮助代码比让我知道的更多，我会分享。

class UserProfileFollowToggle(View):
    def post(self, request, *args, **kwargs):
        print(request.POST)
        user_to_toggle = request.POST.get('username')
        print(user_to_toggle)
        profile_ = UserProfile.objects.get(user__username__iexact=user_to_toggle)
        user = request.user
        if user in profile_.follower.all():
            profile_.follower.remove(user)
        else:
            profile_.follower.add(user)
        return redirect("/posts/list/") 

follow_toggle.html：

<form class='form' method='POST' action={% url 'profiles:toggle' %}>
{% csrf_token %}
<input type='hidden' name='username' value="{% if username %}{{ username }} {% else %}{{ testuser }}{% endif %}">

<button class='btn {% if is_following %}btn-default {% else %}btn-primary{% endif %}'>{% if is_following %}Unfollow {% else %}Follow{% endif %}</button>
</form>

追溯

Environment:


Request Method: POST
Request URL: http://127.0.0.1:8000/profiles/user-profile/

Django Version: 3.0.3
Python Version: 3.8.3
Installed Applications:
['django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'bootstrap3',
 'accounts',
 'posts',
 'profiles']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware']



Traceback (most recent call last):
  File "C:\Users\AHMED\anaconda3\lib\site-packages\django\core\handlers\exception.py", line 34, in inner
    response = get_response(request)
  File "C:\Users\AHMED\anaconda3\lib\site-packages\django\core\handlers\base.py", line 115, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "C:\Users\AHMED\anaconda3\lib\site-packages\django\core\handlers\base.py", line 113, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "C:\Users\AHMED\anaconda3\lib\site-packages\django\views\generic\base.py", line 71, in view
    return self.dispatch(request, *args, **kwargs)
  File "C:\Users\AHMED\anaconda3\lib\site-packages\django\views\generic\base.py", line 97, in dispatch
    return handler(request, *args, **kwargs)
  File "C:\Users\AHMED\grapPub\grabpublic\profiles\views.py", line 31, in post
    profile_ = UserProfile.objects.get(user__username__iexact=user_to_toggle)
  File "C:\Users\AHMED\anaconda3\lib\site-packages\django\db\models\manager.py", line 82, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "C:\Users\AHMED\anaconda3\lib\site-packages\django\db\models\query.py", line 415, in get
    raise self.model.DoesNotExist(

Exception Type: DoesNotExist at /profiles/user-profile/
Exception Value: UserProfile matching query does not exist.

Answer 1

它会在最后渲染一个空格。因此，模板应如下所示：

#                                                                 no space ↓
<input type='hidden' name='username' value="{% if username %}{{ username }}{% else %}{{ testuser }}{% endif %}">