ConnectionPropertyToConnectionAttributeRector

Find another rule

Changes model connection property to use the Connection attribute

 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Attributes\Connection;

+#[Connection('sqlite')]
 class User extends Model
 {
-    protected $connection = 'sqlite';
 }

Configure your rector.php:

<?php

use RectorLaravel\Rector\Class_\ConnectionPropertyToConnectionAttributeRector;
use Rector\Config\RectorConfig;

return RectorConfig::configure()
    ->withRules([
        ConnectionPropertyToConnectionAttributeRector::class,
    ]);