validate_instance_has_members

class ValidateInstanceHasMembers(plugin.MayaInstancePlugin):
    """Validates instance objectSet has *any* members."""

    order = ValidateContentsOrder
    label = 'Instance has members'
    actions = [ayon_maya.api.action.SelectInvalidAction]

    @classmethod
    def get_invalid(cls, instance):
        invalid = list()
        if not instance.data.get("setMembers"):
            objectset_name = instance.data['name']
            invalid.append(objectset_name)

        return invalid

    def process(self, instance):
        # Allow renderlayer, rendersetup and workfile to be empty
        skip_families = {"workfile",
                         "renderlayer",
                         "rendersetup",
                         "mayaUsdLayer",
                         "usdLayer",
                         "usdAsset"}
        families = {instance.data.get("family")}
        families.update(instance.data.get("families", []))
        if families.intersection(skip_families):
            return

        invalid = self.get_invalid(instance)
        if invalid:
            # Invalid will always be a single entry, we log the single name
            name = invalid[0]
            raise PublishValidationError(
                title="Empty instance",
                message="Instance '{0}' is empty".format(name)
            )