docs: def classes(request):
      """Get all classes of current user"""
  
      if not request.user.is_authenticated() or not hasattr(request.user, "userprofile"):
          return render_json(request, {
              'error': _('User is not logged in'),
              'error_type': 'user_unauthorized'
          }, template='user_json.html', status=401)
      clss = [c.to_json() for c in Class.objects.filter(owner=request.user.userprofile)]
  
      return render_json(request, clss, status=200, template='user_json.html', help_text=classes.__doc__)