Re: How to over ride the get context data method in view

Hi,

We can't solve all of your problems for you :) But that being said - in the get_context_data you don't have a parameter for the request, however in all CBV you get the request as a variable on the CBV itself - so change:

post.is_liked = post.likes.filter(user=request.user).exists()

To:

post.is_liked = post.likes.filter(user=self.request.user).exists()

Regards,

Andréas

Den ons 13 maj 2020 kl 22:10 skrev Ahmed Khairy <ahmed.heshameldin@gmail.com>:

still showing the same error

On Wednesday, May 13, 2020 at 2:34:03 PM UTC-4, Yamen Gamal Eldin wrote:

I haven't seen any definition for user within ur function, so 

Change this 

post.is_liked = post.likes.filter(user=user).exists()

To this

post.is_liked = post.likes.filter(user=request.user).exists()

Le mer. 13 mai 2020 à 19:22, Ahmed Khairy <ahmed.he...@gmail.com> a écrit :

Hi There, 

I have rewritten the get_context_data method to be like this but I am getting name 'user' is not defined:

class PostListView(ListView):

    model = Post

    template_name = "score.html"

    ordering = ['-date_posted']

    context_object_name = 'posts'

    paginate_by = 5

    def get_context_data(self, **kwargs):

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

        for post in context_data['posts']:

            post.is_liked = post.likes.filter(user=user).exists() <----- name 'user' is not defined

        return context

I am also using this template just for testing till fix the issue 

Thank you Andreas with me

On Wednesday, May 13, 2020 at 12:31:15 PM UTC-4, Andréas Kühne wrote:

Hi again,

Bare with me - this is just written in this email - so:

1. Your listview is paginated by 5, so it will only show 5 posts - that's good for this exercise and how I would solve it.

2. Rewrite your get_context_data method to iterate over the posts:

    def get_context_data(self, **kwargs):
        context_data = super(PostListView, self).get_context_data(**kwargs)
        for post in context_data['posts']:

            post.is_liked = post.likes.filter(user=user).exists()

        return context

So now your page should show. In the page 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">    <input type="hidden" name="post_id" value="{{post.id}}" />  {% csrf_token %} {% if is_like %}     <button class="ui button positive" type="submit">Unlike</button>

  {% else %}    <button class="ui button negative" type="submit">Like</button>    {% endif %}  </form>  {% endfor %} {% endblock content %} 

Something like this should give you the functionality you want - however it's still a bit cumbersome.

Regards,

Andréas

Den ons 13 maj 2020 kl 15:24 skrev Ahmed Khairy <ahmed.he...@gmail.com>:

Hi Andréas Kühne,

Regarding the first error

I have a list of posts in the listView and want to add the like button to each post so how should I fix it? 

Thank you 

On Wednesday, May 13, 2020 at 6:08:31 AM UTC-4, Andréas Kühne wrote:

Hi,

There are a couple of errors in your code:

1. You are using a ListView and then trying to get an individual post? That is really strange

2. In your get_context_data method - you first get the context data, update it and then you set it to a new dict, so everything is reset in the dict.

3. you are trying to get the absolut url for your post, but aren't showing any post detail view.

Regards,

Andréas

Den ons 13 maj 2020 kl 06:46 skrev Ahmed Khairy <ahmed.he...@gmail.com>:

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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