A little trait to add to models that will have Uuids

HasUuid.php

<?php

// Example usage in a model:

class ExampleModel extends Model
{
    use HasUuid;

    protected $primaryKey = 'uuid';

    public $incrementing = false;
}

// The Trait:

trait HasUuid
{
    public static function bootHasUuid()
    {
        static::creating(function ($model) {
            if (! $model->{$model->getKeyName()}) {
                $model->{$model->getKeyName()} = static::generateUuid();
            }
        });
    }

    public static function generateUuid()
    {
        return (string) Illuminate\Support\Str::uuid();
    }
}