Load Relationships Always, but Dynamically

You can not only specify what relationships to ALWAYS load with the model, but you can do it dynamically, in the constructor method:

 1class ProductTag extends Model
 2{
 3    protected $with = ['product'];
 4 
 5    public function __construct() {
 6        parent::__construct();
 7        $this->with = ['product'];
 8 
 9        if (auth()->check()) {
10            $this->with[] = 'user';
11        }
12    }
13}