In the views file
in the class PostListView(ListView):
1.
def get_queryset(self, **kwargs):
2.
queryset = super(PostListView, self).get_queryset(**kwargs)
1.
return queryset.annotate(
…
1.
total_liked=Count(
2.
'likes',
3.
filter=Q(likes__value="Like")
4.
)).annotate(
5.
user_liked=Case(
6.
When(Q(likes__user=self.request.user) & Q(
On Thursday, May 14, 2020 at 10:07:25 PM UTC-4, Motaz Hejaze wrote:
>
> Where does this exception happen ?
> In which file , which line ?
>
> On Fri, 15 May 2020, 12:51 am Ahmed Khairy, <ahmed.he...@gmail.com
> <javascript:>> wrote:
>
>> 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=<span class="str"
>> style="font-style: inherit; font-variant: inherit; font-weight: inh
>>
>>
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