Exception Value: Related Field got invalid lookup: value

[Ahmed Khairy]

Hi all 

I am adding a like/unlike button for Posts in a Listview, I am getting an error: 

Exception Value:  Related Field got invalid lookup: value

here is the Model:

class Post(models.Model):
    designer = models.ForeignKey(User, on_delete=models.CASCADE)
    title = models.CharField(max_length=100)
    likes = models.ManyToManyField(User, through="Like", related_name='liked')

    def __str__(self):
        return self.title

    def get_absolute_url(self):
        return reverse("score:post-detail", kwargs={'pk': self.pk})


class Like(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    post = models.ForeignKey(Post, on_delete=models.CASCADE)
    value = models.CharField(choices=LIKE_CHOICES,
                             default='Like', max_length=10)

   def toggle_value(self):
       if self.value == "Like":
           self.value = "Unlike"
       else:
           self.value = "Like"

    def __str__(self):
        return str(self.post.pk)

the view:

def like_post(request):
    user = request.user
    if request.method == 'Post':
        post_id = request.POST.get('post_id')
        post_obj = Post.objects.get(id=post_id)        
        like, created = Like.objects.get_or_create(user=user, post_id=post_id)

        if not created:
            like.toggle_value()
            like.save()
    return redirect('score:score')
class PostListView(ListView):
    model = Post
    template_name = "score.html"
    ordering = ['-date_posted']
    context_object_name = 'posts'
    queryset = Post.objects.filter(admin_approved=True)
    paginate_by = 5

    def get_queryset(self, **kwargs):
       queryset = super(PostListView, self).get_queryset(**kwargs):
       return queryset.annotate(
           total_liked=Count(
                'likes',
                filter=Q(likes__value="Like")
           ).annotate(
                user_liked=Case(
                When(Q(likes__user=self.request.user) & Q(likes__value="Like"), then=Value(True)),
                default=Value(False),
                output_field = BooleanField()
           )
       )

Here is the template
{% for post in posts %}
     <div style="padding-top:200 px"><strong>{{post.title}}</strong></div>

       <form action="{% url 'score:like_post'%}" method='POST' class="ui form">
           {% csrf_token %}
           <input type='hidden' name='post_id' value="{{post.id}}">
           {% if post.user_liked %}
               <button class= "ui button positive" type='submit'> Like </button>
           {% else %}
               <button class= "ui button negative" type='submit'> Unlike </button>
           {% endif %}
       </form>
       <strong>{{post.total_liked}} Likes </strong>

{% endfor %}
Here is the URL 
    path('', PostListView.as_view(), name='score'),
    path('like/', like_post, name='like_post'),

Thank you 

[Motaz Hejaze]

Where does this exception happen ?

In which file , which line ? 

Here is the template

           <input type='hidden' name='post_id' value=<span class="str" style="font-style: inherit; font-variant: inherit; font-weight: inh

[Ahmed Khairy]

In the views file 

in the class PostListView(ListView):

31.     def get_queryset(self, **kwargs):

32.         queryset = super(PostListView, self).get_queryset(**kwargs)

38.         return queryset.annotate(

    …

39.             total_liked=Count(

40.                 'likes',

41.                 filter=Q(likes__value="Like")

39.             )).annotate(

40.                 user_liked=Case(

41.                     When(Q(likes__user=self.request.user) & Q(