Freund passende Abfrage nicht vorhanden

Question

views.py

def get(self, request): 
    form = HomeForm() 
    posts = Post.objects.all().order_by('-created') 
    users = User.objects.exclude(id=request.user.id, 
           friend = Friend.objects.get(current_user=request.user), 
           friends = friend.users.all()) 

    args = { 'form': form, 'posts': posts, 'users': users, 'friends': friends} 
    return render(request, self.template_name, args) 

models.py

class Post(models.Model): 
    post = models.CharField(max_length=500) 
    user = models.ForeignKey(User) 
    created = models.DateTimeField(auto_now_add=True) 
    updated = models.DateTimeField(auto_now=True) 

class Friend(models.Model): 
    users = models.ManyToManyField(User) 
    current_user = models.ForeignKey(User, related_name='owner', 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) 

Answer 1

Sie haben try except zu verwenden, wenn Freund passende Abfrage nicht existiert. Sie haben Dokumentation darüber: Try Except

In ersten Mal schreiben Sie:

try : 
    ... 

except : 
    #when you get doesn't exist