WP_REST_Template_Revisions_Controller::get_parent( string $parent_template_id ): WP_Post|WP_Error

Source

protected function get_parent( $parent_template_id ) {
	$template = get_block_template( $parent_template_id, $this->parent_post_type );
	if ( ! $template ) {
		return new WP_Error(
			'rest_post_invalid_parent',
			__( 'Invalid template parent ID.' ),
			array( 'status' => WP_Http::NOT_FOUND )
		);
	}
	$parent_post_id = isset( $template->wp_id ) ? (int) $template->wp_id : 0;
	if ( $parent_post_id <= 0 ) {
		return new WP_Error(
			'rest_invalid_template',
			__( 'Templates based on theme files can\'t have revisions.' ),
			array( 'status' => WP_Http::BAD_REQUEST )
		);
	}
	return get_post( $template->wp_id );
}

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