How to over ride the get context data method in view

I am currently trying to create a like button for my posts in Django

I have reached to the part where I can add a like but I am facing difficulty writing the code related to the view which linking the PostListView if there is user who liked it or not. I am getting an error: page Error 404 although everything is correct

this the views: 

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_context_data(self, **kwargs):

        post = get_object_or_404(Post, id=self.request.POST.get('post_id'))

        context = super(PostListView, self).get_context_data(**kwargs)

        context['posts'][0].likes.filter(id=self.request.user.id).exists()

        is_liked = False

        if post.likes.filter(id=self.request.user.id).exists():

            is_liked = True

        context = {'post': post,

                   'is_like': is_liked,

                   }

        return context

def like_post(request):

    post = get_object_or_404(Post, id=request.POST.get('post_id'))

    is_liked = False

    if post.likes.filter(id=request.user.id).exists():

        posts.likes.remove(request.user)

        is_liked = False

    else:

        post.likes.add(request.user)

        is_liked = True

    return HttpResponseRedirect(post.get_absolute_url())

This is the model 

class Post(models.Model):      designer = models.ForeignKey(User, on_delete=models.CASCADE)      title = models.CharField(max_length=100)      date_posted = models.DateTimeField(default=timezone.now)      likes = models.ManyToManyField(User, blank=True, related_name='likes')        def __str__(self):          return self.title

Here is the

path('like/', like_post, name='like_post'),

here is the template: 

{% extends "base.html"%} {% block content %} {% 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 %} {% if is_like %}    <input type="hidden" name="post_id" value="{{post.id}}" />    <button class="ui button positive" type="submit">Unlike</button>    {% else %}    <button class="ui button negative" type="submit">Like</button>    {% endif %}  </form>  <strong>Likes </strong>    

{% endfor %} {% endblock content %} 

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