# Decorators

## **clean_message**

Decorator that cleans up general inertia messages so they don't appear in all visited views.

```shell
def clean_message(func):
     """
     Clean share sessions if there is no message from other view
     """

     @wraps(func)
     def wrapper(request, *args, **kwargs):
         if not request.session["share"].get("message_other_view", False):
             share_flash(request, error=False, success=False)
             share(request, "errors", {})
         share(request, "message_other_view", False)

         return func(request, *args, **kwargs)

     return wrapper
```

## **group_required**

Decorator that validates that a user belongs to the indicated group

```shell
def group_required(*group_names):
     """Requires user membership in at least one of the groups passed in."""

     def in_groups(u):
         if u.is_authenticated:
             if bool(u.groups.filter(name__in=group_names)) | u.is_superuser:
                 return True
         returnFalse

     return user_passes_test(in_groups, login_url="/403", redirect_field_name=None)
```

The way to use them is as follows:

```shell
@group_required("management")
```

## **json_format_required**

Decorator to validate that the data in the request is in json format.

```shell
def json_format_required(func, method="POST"):
     """
     Validate json format in request data
     """

     @wraps(func)
     def wrapper(request, *args, **kwargs):
         if request.method == method:
             try:
                 json.loads(request.body)
             except json.decoder.JSONDecodeError:
                 return JsonResponse(
                     {"error": True, "message": "Json format required in data"},
                     status=400,
                     safe=False,
                 )

         return func(request, *args, **kwargs)

     return wrapper
```