from django.core.exceptions import PermissionDenied

def role_required(allowed_roles):
    """
    Usage:
    @role_required(["manager", "businessman"])
    def view(request):
        ...
    """
    def decorator(view_func):
        def _wrapped_view(request, *args, **kwargs):
            if request.user.role not in allowed_roles:
                raise PermissionDenied
            return view_func(request, *args, **kwargs)
        return _wrapped_view
    return decorator