blue-twilight/database/data_migrations/DataMigrationV2_0_0_alpha_1.php

<?php

use App\Album;
use App\DataMigration;

class DataMigrationV2_0_0_alpha_1 extends DataMigration
{
    public function getVersion()
    {
        return '2.0.0-alpha.1';
    }

    public function run($currentVersion)
    {
        $this->storeAlbumUrlPaths();
    }

    /**
     * Ensures all albums have a full URL path stored.
     * @return void
     */
    private function storeAlbumUrlPaths()
    {
        $albumsWithNoPath = Album::where('url_path', null)->get();

        /** @var Album $album */
        foreach ($albumsWithNoPath as $album)
        {
            $album->touch();
        }
    }
}