I added a Like model but I don't know how to increase the number of like

Question

I created a Blog app, and i want to add a Like button to each post in the Blog, how can i do this ? how can i make this happen in view and the template ?

the models:

class Like(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    post = models.ForeignKey(Photo, on_delete=models.CASCADE)

    def __str__(self):
        return str(self.user)

the view:

def viewPhoto(request, pk):
    post = get_object_or_404(Photo, id=pk)
    photo = Photo.objects.get(id=pk)
    return render(request, 'photo.html', {'photo': photo, 'post': post })