Sortable posts views column in main articles page

// Register the column as sortable
function views_column_register_sortable( $columns ) {
    $columns['views'] = 'views';

    return $columns;
}
add_filter( 'manage_edit-post_sortable_columns', 'views_column_register_sortable' );


function views_column_orderby( $vars ) {
    if ( isset( $vars['orderby'] ) && 'view' == $vars['orderby'] ) {
        $vars = array_merge( $vars, array(
            'meta_key' => 'view',
            'orderby' => 'meta_value_num'
        ) );
    }

    return $vars;
}
add_filter( 'request', 'views_column_orderby' );