WP_REST_Controller::add_additional_fields_to_object( array $response_data, WP_REST_Request $request ): array

Source

protected function add_additional_fields_to_object( $response_data, $request ) {

	$additional_fields = $this->get_additional_fields();

	$requested_fields = $this->get_fields_for_response( $request );

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

		if ( ! rest_is_field_included( $field_name, $requested_fields ) ) {
			continue;
		}

		$response_data[ $field_name ] = call_user_func(
			$field_options['get_callback'],
			$response_data,
			$field_name,
			$request,
			$this->get_object_type()
		);
	}

	return $response_data;
}

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