Restrict non admin to only show image that they upload

ml_restrict_media_library.php

add_action( 'pre_get_posts', 'ml_restrict_media_library' );
function ml_restrict_media_library( $wp_query_obj ) {

    global $current_user, $pagenow;

    if (!in_array( 'administrator', $current_user->roles )){
        if( !is_a( $current_user, 'WP_User') )
            return;

        if( 'admin-ajax.php' != $pagenow || $_REQUEST['action'] != 'query-attachments' )
            return;

        if( !current_user_can('manage_media_library') ) {
            $wp_query_obj->set('author', $current_user->ID );
            return;
        }
    }
}