Flush Rewrite Rules on init or rest_api_init?

Flushing rewrite rule should not be done on routine basis, as stated per codex: Don’t do it on any hook that will triggered on a routine basis. You should either do it via the plugin activation hooks, or the theme switch hooks: add_action( ‘after_switch_theme’, ‘wpse315001_flush_rewrite_rules’ ); register_deactivation_hook( __FILE__, ‘wpse315001_flush_rewrite_rules’ ); register_activation_hook( __FILE__, ‘wpse315001_flush_rewrite_rules’ ); function … Read more

ACF attachment custom field in rest response

Check out ACF to REST API – https://github.com/airesvsg/acf-to-rest-api You can optionally turn on/off which fields you want to enable. // Enable the option show in rest add_filter( ‘acf/rest_api/field_settings/show_in_rest’, ‘__return_true’ ); // Enable the option edit in rest add_filter( ‘acf/rest_api/field_settings/edit_in_rest’, ‘__return_true’ );