wordpress functions.php

// this will effect all relationship fields
// if you only want to effect specific fields
// see https://www.advancedcustomfields.com/resources/acf-fields-relationship-query/
add_filter('acf/fields/relationship/query', 'relationship_only_own_posts', 10, 3);
function relationship_only_own_posts($args, $field, $post_id) {

	// ACFのcourseの値で、表示する前提条件を絞る
	$args['meta_key'] = 'course';
	$post = get_fields($post_id);
	$post_course = $post["course"];
	//error_log(print_r($post_course->ID, true));
	// error_log($post_id);
	$args['meta_value'] = $post_course->ID;
	// このエントリーを候補に出さない
	$args['post__not_in'] = array($post_id);

	// update core is something only available to admin
	// or super admin on mutlisite
	// a lot less code than looking through roles
	if (current_user_can('update_core')) {
	// not on admin or editor
		return $args;
	}
	$author = get_current_user_id();
	$args['author'] = $author;
	return $args;
}


function sb_add_cpts_to_api() {
	global $wp_post_types;

        // Add CPT slugs here
	$arr = ['course','mission'];

	foreach( $arr as $key ) {
		// If the post type doesn't exist, skip it
		if (!$wp_post_types[$key]) {
			continue;
		} else {
			$wp_post_types[$key]->show_in_rest = true;
			$wp_post_types[$key]->rest_base = $key;
		}
		
	}
}
add_action( 'init', 'sb_add_cpts_to_api', 30 );