public function add_post( $args, $assoc_args ) {

		$assoc_args['object-id'] = $args[1];
		unset( $args[1] );
		$post = get_post( $assoc_args['object-id'] );
		if ( ! $post ) {
			WP_CLI::error( 'Invalid post.' );
		}
		$assoc_args['object'] = $post->post_type;

		$this->add_or_update_item( 'add', 'post_type', $args, $assoc_args );
	}