You can use Eloquent events https://laravel.com/docs/5.5/eloquent#events

class Travel extends Model
{
    ...

    public static function boot() {
	parent::boot();

	static::creating( function( $model ) {
		$model->formatMyPoint();
	} );

	static::updating( function( $model ) {
		$model->formatMyPoint();
	} );
    }

    protected function formatMyPoint() {
	$this->my_point = DB::raw('POINT(' . $this->x . ' ' . $this->y . ')');
    }
}

Thanks for your reply!

I've used the saving event, that is fired on create and update and it works fine, but I need to avoid Eloquent trying to save this->x and this->y to database. I think I can do it with unset(this->x/y) but I will prefer a cleaner way.

Regards.