// add custom columns
add_filter('manage_ii-movies_posts_columns' , 'ii_add_movies_columns');
// add corresponding values
add_action( 'manage_ii-movies_posts_custom_column', 'ii_add_movies_values', 10, 2 );
// make them sortable
add_filter('manage_ii-movies_sortable_columns','ii_make_sortable_columns');
// This function deals with managing all movies
function ii_add_movies_columns() {
    return array(
        'cb' => '<input type="checkbox" />',
        'title' => __('Title'),
        'year' => __('Year'),
        'directors' => __('Director(s)'),
        'genres' =>__( 'Genres'),
        'date'=>__('Date of publication')
    );
}
function ii_add_movies_values( $column, $post_id ) {
    global $post;
    if ($column == 'directors') {
        // Get the meta
        $director = get_post_meta( $post_id, 'director', true );
        if ( empty( $director ) ) { echo __( 'not set' ); }
        else {
            for ($i=0;$i<count($director);$i++) {
                $directors[]=$director[$i]['name'];
            }
            echo implode(' / ',$directors);
        }
    }
    elseif ($column == 'year') {
        // Get the meta
        $year = get_post_meta( $post_id, 'year', true );
        if ( empty( $year ) ) { echo __( 'not set' ); }
        else {                      echo $year; }
    }
    elseif ($column == 'genres') {
        // Get the meta
        $genres = get_post_meta( $post_id, 'genres', true );
        if ( empty( $genres ) ) {   echo __( 'not set' ); }
        else {
            echo implode(' / ',$genres);
        }
    }
}
function ii_make_sortable_columns($columns){
    // function is never called
    unset($columns['date']);
    return $columns;
}