Django会话将参数从一个视图传递到另一个视图，但为所有用户实例设置相同的值

Question

我正在从一个基于类的视图followtogleapiview向另一个userdetailapieview传递（is\u followed）参数。我使用Django会话（从这个平台上读取其他线程）来实现这一点，希望在UserSingleProfileSerializer上显示user\u to\u toggle变量的follow status（True或False）。你知道吗

以下是我的观点：

class UserDetailAPIVIew(generics.RetrieveAPIView):
'''
Displays a list of a user's posts
'''
serializer_class = UserSingleProfileSerializer
queryset = User.objects.all()

def get_object(self):
    self.object = get_object_or_404(User,                                
                    username__iexact=self.kwargs.get('username')
                    )
    return self.object

def get_serializer_context(self):
    '''
    passing the extra is_following argument to the UserDetailAPIVIew
    '''
    context = super(UserDetailAPIVIew, self).get_serializer_context()
    is_followed = self.request.session.get('followed')
    context.update({'followed': is_followed})
    return context


class FollowToggleAPIView(APIView):
'''
Uses the custom model manager for user toggle follow
'''
def get(self, request, username, format=None):
    user_to_toggle = get_object_or_404(User, username__iexact=username)
    me = request.user
    message = 'Not allowed'

    if request.user.is_authenticated():
        is_followed = UserProfile.objects.toggle_follow(me, user_to_toggle)
        request.session['followed'] = is_followed
        return Response({'followed': is_followed})
    return Response({'message': message}, status=400)

toggle\u follow方法在自定义模型管理器中定义如下：

class UserProfileManager(models.Manager):

def toggle_follow(self, user, to_toggle_user):
    ''' follow unfollow users '''
    user_profile, created = UserProfile.objects.get_or_create(user=user)
    if to_toggle_user in user_profile.following.all():
        user_profile.following.remove(to_toggle_user)
        added = False
    else:
        user_profile.following.add(to_toggle_user)
        added = True
    return added


class UserProfile(models.Model):
'''
Extends the Django User model
'''
user = models.OneToOneField(settings.AUTH_USER_MODEL,
                            related_name='profile')
following = models.ManyToManyField(settings.AUTH_USER_MODEL,
                                    blank=True,
                                    related_name='followed_by')


objects = UserProfileManager()

def get_absolute_url(self):
    return reverse_lazy('profiles:detail',
                        kwargs={'username':self.user.username})

def __str__(self):
    return 'Username: {} [ Followers ({}); 
         Following({})]'.format(self.user.username,                                   
         self.user.followed_by.all().count(),
         self.following.all().count())

那个网址.py地址：

urlpatterns = [
    url(r'^(?P<username>[\w.@+-]+)/$', UserDetailAPIVIew.as_view(), 
        name='user-posts-api'),
    url(r'^(?P<username>[\w.@+-]+)/follow/$', 
        FollowToggleAPIView.as_view(), name='follow-api'),
]

唯一的问题是，UserSingleProfileSerializer中显示的（后面跟着）值一次为所有用户实例设置（而不是为我们要跟随的特定用户设置）。你知道吗

我当然不会同时跟踪/取消跟踪所有用户（因为followtogleapiview通过用户名针对特定用户）。你知道吗

我想知道如何将（的值只传递给userdetailapieview中的特定用户（user-to-toggle）。先谢谢你。你知道吗

Answer 1

在这里使用会话是完全错误的。您正在存储一个“followed”值，该值只记录他们切换的最后一个用户，与他们实际查看的配置文件没有关系。你知道吗

与其这样做，您只需在userdetailapieview中查询特定用户的后续状态。你知道吗

def get_serializer_context(self):
    context = super(UserDetailAPIVIew, self).get_serializer_context()
    is_followed = self.request.user.profile.following.filter(username=self.object).exists()
    context.update({'followed': is_followed})
    return context

另外请注意，toggle方法本身效率很低—不需要从数据库中检索每个follow来检查当前用户是否在其中。再次使用exists：

user_profile, created = UserProfile.objects.get_or_create(user=user) 
if user_profile.following.filter(username=to_toggle_user).exists():