Create unique random values for Eloquent Model.

HasRandomFields.php

<?php

namespace App\Eloquent\Concerns;

use Illuminate\Database\Eloquent\Model;

trait HasRandomFields
{
    public static function bootHasRandomFields()
    {
        static::creating(function (Model $model) {
            $model->setRandomFields();
        });
    }

    public function randomFields(): array
    {
        return [];
    }

    public function setRandomFields(): void
    {
        $fields = $this->randomFields();

        foreach ($fields as $field => $callback) {
            if (is_null($this->{$field})) {
                $this->{$field} = $this->makeUnique($field, $callback);
            }
        }
    }

    public function makeUnique($field, $callback): string
    {
        $value = $callback();

        while ($this->where($field, $value)->exists()) {
            $value = $callback();
        }

        return $value;
    }
}

Order.php

<?php

namespace App\Models;

use App\Eloquent\Concerns\HasRandomFields;
use Illuminate\Database\Eloquent\Model;

class Order extends Model
{
    use HasFactory, HasRandomFields;

    protected $fillable = [
        'token',
        // the other fillable fields...
    ];

    public function randomFields(): array
    {
        return [
            'token' => fn () => Str::random(24),
            // the other random fields.
        ];
    }
}