public function __construct() {

		add_filter( 'post_row_actions', array( $this, 'add_links' ), 1, 2 );

		add_filter( 'manage_course_posts_columns', array( $this, 'add_columns' ), 10, 1 );
		add_action( 'manage_course_posts_custom_column', array( $this, 'manage_columns' ), 10, 2 );

		add_filter( 'bulk_actions-edit-course', array( $this, 'register_bulk_actions' ) );
		add_filter( 'handle_bulk_actions-edit-course', array( $this, 'handle_bulk_actions' ), 10, 3 );
	}