docs: def clean(self, *args, **kwargs):
          """
          Check if rating can be inserted for parent node or parent layer
          """
          if not self.pk:
              node = self.node
              layer = Layer.objects.get(pk=node.layer_id)
              if layer.participation_settings.rating_allowed is not True:
                  raise ValidationError("Rating not allowed for this layer")
              if node.participation_settings.rating_allowed is not True:
                  raise ValidationError("Rating not allowed for this node")