old_contents: from django.shortcuts import get_object_or_404, render
  from django.http import HttpResponseRedirect, HttpResponse, Http404
  from django.core.urlresolvers import reverse
  from dwitter.models import Dweet
  from django.contrib.auth.decorators import login_required
  
  def feed(request, page_nr):
    page = int(page_nr)
    dweets_per_page = 5
    first = (page - 1) * dweets_per_page
    last = page * dweets_per_page
    dweet_count = Dweet.objects.count()
  
    if(first < 0 or first > dweet_count):
      raise Http404("No such page")
    if(last >= dweet_count ):
      last = dweet_count - 1;
    
    dweet_list = Dweet.objects.order_by('-posted')[first:last]
    context = {'dweet_list': dweet_list
              ,'header_title': 'Global feed'
              ,'page_nr': page
              ,'next_url': reverse('feed', kwargs={'page_nr': page + 1})
              ,'prev_url': reverse('feed', kwargs={'page_nr': page - 1})
              }
    return render(request, 'feed/feed.html', context );
  
  
  from django.contrib.auth.models import User
  from django.utils import timezone
  
  @login_required
  def dweet(request):
    d = Dweet(code = request.POST['code']
        , author = request.user 
        , posted = timezone.now() )
    d.save()
    return HttpResponseRedirect(reverse('feed'))
  
  @login_required
  def like(request, post_id):
    dweet = get_object_or_404(Dweet, id=post_id) 
    dweet.likes.add(request.user)
    dweet.save()
    return HttpResponseRedirect(reverse('feed'))
  
new_contents: from django.shortcuts import get_object_or_404, render
  from django.http import HttpResponseRedirect, HttpResponse, Http404
  from django.core.urlresolvers import reverse
  from dwitter.models import Dweet
  from django.contrib.auth.decorators import login_required
  
  def feed(request, page_nr):
    page = int(page_nr)
    dweets_per_page = 5
    first = (page - 1) * dweets_per_page
    last = page * dweets_per_page
    dweet_count = Dweet.objects.count()
  
    if(first < 0 or first > dweet_count):
      raise Http404("No such page")
    if(last >= dweet_count ):
      last = dweet_count;
    
    dweet_list = Dweet.objects.order_by('-posted')[first:last]
    context = {'dweet_list': dweet_list
              ,'header_title': 'Global feed'
              ,'page_nr': page
              ,'next_url': reverse('feed', kwargs={'page_nr': page + 1})
              ,'prev_url': reverse('feed', kwargs={'page_nr': page - 1})
              }
    return render(request, 'feed/feed.html', context );
  
  
  from django.contrib.auth.models import User
  from django.utils import timezone
  
  @login_required
  def dweet(request):
    d = Dweet(code = request.POST['code']
        , author = request.user 
        , posted = timezone.now() )
    d.save()
    return HttpResponseRedirect(reverse('feed'))
  
  @login_required
  def like(request, post_id):
    dweet = get_object_or_404(Dweet, id=post_id) 
    dweet.likes.add(request.user)
    dweet.save()
    return HttpResponseRedirect(reverse('feed'))
  
subject: Fix feed page bug