如何将朋友系统添加到django

Question

我一直试图在django中添加一个朋友系统，用户可以在其中添加和删除朋友，在此过程中，我发现Friend匹配查询不存在错误，并显示这部分代码是错误的：

    friend = Friend.objects.get(current_user=request.user) 

现在我将保留完整的代码。

views.py

    def profile(request, username=None):
        friend = Friend.objects.get(current_user=request.user)
        friends = friend.users.all()
        if username:
          post_owner = get_object_or_404(User, username=username)
          user_posts=Post.objects.filter(user_id=post_owner) 
        else:
          post_owner = request.user
          user_posts=Post.objects.filter(user=request.user)
        args1 = {
          'post_owner': post_owner,
          'user_posts': user_posts,
          'friends': friends,
        }
        return render(request, 'profile.html', args1)

    def change_friends(request, operation, pk):
        friend = User.objects.get(pk=pk)
        if operation == 'add':
          Friend.make_friends(request.user, friend)
        elif operation == 'remove':
          Friend.lose_friends(request.user, friend)
        return redirect('profile')

models.py

    class Friend(models.Model):
        users = models.ManyToManyField(User, default='users', blank=True, related_name='users')
        current_user = models.ForeignKey(User, related_name='owner', on_delete=models.CASCADE, null=True)

        @classmethod
        def make_friend(cls, current_user, new_friend):
            friend, created = cls.objects.get_or_create(
                current_user=current_user
            )
            friend.users.add(new_friend)

        @classmethod
        def lose_friend(cls, current_user, new_friend):
            friend, created = cls.objects.get_or_create(
                current_user=current_user
            )
            friend.users.remove(new_friend)

如果需要profile.html，请告诉我：）

Answer 1

request.user没有朋友记录，错误表明。您可以简单地将get操作更改为filter＆first操作。 Friend.objects.filter(current_user=request.user).first()然后不要忘记检查朋友实例是否存在。因此，您的视图应类似于：