code: public function column_user( AbstractLog $item ) {
  
  		$user = $item->get_user();
  
  		if ( empty( $user ) ) {
  			echo '-';
  		} else {
  			echo $user->display_name;
  		}
  	}
docs: Render the user column.
  
  @since 1.0
  
  @param AbstractLog $item