Django: TypeError: 'Like' object is not iterable (Ajax request)

问题

I am not getting a clear picture regarding the Model (Like) object is not iterable.

Error

liked, created = Like.objects.create(question=create_id)
TypeError: 'Like' object is not iterable

model.py

class Question(models.Model):
    user = models.ForeignKey(User)
    title = models.CharField(max_length= 200)
    description = models.TextField()
    location = models.CharField(max_length=150)
    tags = TaggableManager()
    time = models.DateTimeField(auto_now_add=True)

    def __unicode__(self):
        return self.title


class Like(models.Model):
    user = models.ManyToManyField(User, related_name='likes')
    question = models.ForeignKey(Question)
    date = models.DateTimeField(auto_now_add=True)
    likecount = models.IntegerField(default=0)

urls.py

 url(r'^like/$', 'apps.question.views.like', name='like'),

views.py

def like(request):
    vars = {}
    if request.method == 'POST':
        user = request.user
        tutorial_id = request.POST.get('tutorial_id', None)
        create_id = get_object_or_404(Question, id=tutorial_id)

        liked, created = Like.objects.create(question=create_id)

        try:
            user_liked = Like.objects.get(question=create_id, user=user)
        except:
            user_liked = None

        if user_liked:
            user_liked.likecount -= 1
            liked.user.remove(request.user)
            user_liked.save()
        else:
            liked.user.add(request.user)
            liked.likecount += 1
            liked.save()

    return HttpResponse(simplejson.dumps(vars, user),
                    mimetype='application/javascript')

template

<button type="button" class="btn btn-request" name="{{question.id}}" id="like">Request</button>

<script>
  $('#like').click(function(){

        $.ajax({
                 type: "POST",
                 url: "{% url 'like' %}",
                 data: {'tutorial_id': $(this).attr('name'), 'csrfmiddlewaretoken': '{{csrf_token}}'},

                 dataType: "text",
                 success: function(response) {
                        alert('You liked this')
                  },
                  error: function(rs, e) {
                        alert(rs.responseText);
                  }
            }); 
      })
  </script>

What I am missing here, can anyone explain me?

Thanks!

回答1:

Like.objects.create(question=create_id)

Returns a single object (a Like).

So, doing like, created = Like.objects.create(question=create_id) doesn't work because there's only one item on the right, so it can't be unpacked (like if you did like, created = 1).

The method that returns the object and a created boolean object is get_or_create:

like, created = Like.objects.get_or_create(question=create_id)

来源：https://stackoverflow.com/questions/22070607/django-typeerror-like-object-is-not-iterable-ajax-request

标签

ajax

django

iterable