tuyakhov / yii2-json-api

     */

    protected function checkIdentification(ResourceInterface $resource)

    {

        if (!is_string($resource->getId())) {

            throw new InvalidValueException(

                'The values id of resource object ' . get_class ($resource) . ' MUST be a string.'

            );

        }

        if (!is_string($resource->getType())) {

            throw new InvalidValueException(

            );

        }

        if (!is_string($resource->getType())) {

            throw new InvalidValueException(

                'The values type of resource object ' . get_class ($resource) . ' MUST be a string.'

            );

        }

    }

}