cerebrate/config/Migrations/20220918000001_unique_usern...

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<?php
declare(strict_types=1);
use Migrations\AbstractMigration;
final class UniqueUserNames extends AbstractMigration
{
/**
* Change Method.
*
* Write your reversible migrations using this method.
*
* More information on writing migrations is available here:
* https://book.cakephp.org/phinx/0/en/migrations.html#the-change-method
*
* Remember to call "create()" or "update()" and NOT "save()" when working
* with the Table class.
*/
public function change(): void
{
$table = $this->table('users');
$exists = $table->hasIndexByName('users', 'username');
$this->execute('DELETE FROM users WHERE id NOT IN (SELECT MIN(id) FROM (select * from users) AS u2 GROUP BY LOWER(u2.username));');
if (!$exists) {
$table->addIndex(
[
'username'
],
[
'unique' => true
]
)->save();
}
}
}