WordPress at a glance
function is not described

WP_REST_Controller::update_additional_fields_for_object() protected WP 4.7.0

Updates the values of additional fields added to a data object.

{} It's a method of the class: WP_REST_Controller{}

No Hooks.

Return

true/false/WP_Error. True on success, WP_Error object if a field cannot be updated.

Usage

// protected - for code of main (parent) or child class
$result = $this->update_additional_fields_for_object( $object, $request );
$object(object) (required)
Data model like WP_Term or WP_Post.
$request(WP_REST_Request) (required)
Full details about the request.

Changelog

Since 4.7.0 Introduced.

Code of WP_REST_Controller::update_additional_fields_for_object() WP 5.5.1

<?php
protected function update_additional_fields_for_object( $object, $request ) {
	$additional_fields = $this->get_additional_fields();

	foreach ( $additional_fields as $field_name => $field_options ) {
		if ( ! $field_options['update_callback'] ) {
			continue;
		}

		// Don't run the update callbacks if the data wasn't passed in the request.
		if ( ! isset( $request[ $field_name ] ) ) {
			continue;
		}

		$result = call_user_func( $field_options['update_callback'], $request[ $field_name ], $object, $field_name, $request, $this->get_object_type() );

		if ( is_wp_error( $result ) ) {
			return $result;
		}
	}

	return true;
}