WordPress Plugin so that client-event role users can only see their posts.

view-only-your-posts.php

<?php
/*
Plugin Name: View only your posts
Description:Small plugin so that client-event users can only see their posts.
Author: Jason Rowe
 */

function posts_for_current_author($query) {
    global $pagenow;
 	$tempuser = wp_get_current_user();


    if( 'edit.php' != $pagenow || !$query->is_admin )
        return $query;
 
    if( in_array( 'client-event', (array) $tempuser->roles ) ) {
    	add_action( 'views_edit-post', 'child_remove_some_post_views' );
        global $user_ID;
        $query->set('author', $user_ID );
    }
    return $query;
}
function child_remove_some_post_views( $views ) {
	unset($views['all']);
	unset($views['publish']);
	unset($views['trash']);
	unset($views['draft']);
	unset($views['pending']);
	return $views;
}
add_filter('pre_get_posts', 'posts_for_current_author');

// Below is example for a specific right check
// credit goes to http://www.wpbeginner.com/plugins/how-to-limit-authors-to-their-own-posts-in-wordpress-admin/
// function posts_for_current_author($query) {
//     global $pagenow;
 
//     if( 'edit.php' != $pagenow || !$query->is_admin )
//         return $query;
 
//     if( !current_user_can( 'edit_others_posts' ) ) {
//         global $user_ID;
//         $query->set('author', $user_ID );
//     }
//     return $query;
// }
// add_filter('pre_get_posts', 'posts_for_current_author');