Using a permission class on a detail route

Question

How can I only apply a permission class to a detail route?

class EventViewSet(viewsets.ModelViewSet):

    @detail_route(methods=['post'])
    def messages(self, request, pk=None):
        ### Check a permissions class.
        ...

Answer 1

Update-1

From DRF 3.8 onwards, detail_route decorator has replaced with action decorator.

class EventViewSet(viewsets.ModelViewSet):
    @action(permission_classes=[permissions.PermissionClass_], methods=['post'])
    def messages(self, request, pk=None):
        # your view code

Original post

You can add permissions basically by doing this:

class EventViewSet(viewsets.ModelViewSet):
    @detail_route(
        permission_classes=[
            permissions.PermissionClass_],
        methods=['post'])
    def messages(self, request, pk=None):
        ### Check a permissions class.
        ...