def list_mostre(request):
    category = db.Query(Categoria).filter("name =", 'mostre').get()
    if category:
      return object_list(request, News.all().order('-created').filter('published =', True).filter('category  =', category.key()), paginate_by=5)
    else:
      return render_to_response(request, 'no_items.html')
def home(request):
    return object_list(request, News.all(), paginate_by=5)