Laravel - how to makeVisible an attribute in a Laravel relation?

Question

I use in my model code to get a relation

class User extends Authenticatable
{
    // ...
    public function extensions()
    {
        return $this->belo         


        

Answer 1

The highest voted answer didn't seem to work for me (the relations attribute seems to be a protected array now so can't be used as a collection in @DevK's answer), I instead used:

$parent->setRelation('child', $parent->child->first()->setVisible(['id']));