code: def create_class(request):
      if request.method == 'GET':
          return render(request, 'classes_create.html', {}, help_text=create_class.__doc__)
      if request.method == 'POST':
          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='classes_create.html', status=401)
          data = json_body(request.body.decode("utf-8"))
          if 'code' in data and Class.objects.filter(code=data['code']).exists():
              return render_json(request, {
                  'error': _('A class with this code already exists.'),
                  'error_type': 'class_with_code_exists'
              }, template='classes_create.html', status=400)
          if 'name' not in data or not data['name']:
              return render_json(request, {'error': _('Class name is missing.'), 'error_type': 'missing_class_name'},
                                 template='classes_create.html', status=400)
          cls = Class(name=data['name'], owner=request.user.userprofile)
          if 'code' in data:
              cls.code = data['code']
          cls.save()
          return render_json(request, cls.to_json(), template='classes_create.html', status=201)
      else:
          return HttpResponseBadRequest("method %s is not allowed".format(request.method))