How to get only one instance of a model in views

Question

I am Building a BlogApp and I am stuck on a Problem.

What i am trying to do

I am trying to access all the data of only one Model instance in Function Based View.

In Brief

I am trying to show all the posts liked by a all the users in a particular page.

What have i tried

  1). post = Paintings.objects.filter(likes=pk)

• This didn't work because it only show the logged in user's posts. AND i want to get all the posts that are liked.

  2). post = Paintings.objects.all()
  

• This also didn't work for me.

models.py

class Post(models.Model):
    post_owner = models.ForeignKey(User,default='',null=True,on_delete=models.CASCADE)
    likes = models.ManyToManyField(User, related_name='post_like', blank=True)

views.py

def featured_paintings(request,pk):
    post = Post.objects.filter(likes=pk)

    context = {'post':post}
    return render(request, 'mains/featured_posts.html', context)

I don't know what to do.

Any help would be appreciated.

Thank You in Advance

Answer 1

Try excluding Posts that match likes=None this will give you all instances who have atleast one like:

post = Post.objects.exclude(likes=None)

Answer 2

You can use the isnull lookup to filter a relationship having at least one related object

Post.objects.filter(likes__isnull=False)