Should linking work in yii2 child class?

Question

Yii

Why is the connection not clinging?

class Foo extends ActiveRecord{
    ....
}

class Bar extends Foo{

    public function getOption(){
        return $this->hasOne(...);
    }
}

Attempt to access:
var_dump($bar->option);
Returns:
Undefined property: app\models\Bar::$option
PS Forgot Yii2 tag
Dealing with links: www.yiiframework.com/doc-2.0/guide-db-active-recor...
PPS
I put the link in Bar and instantiate it and no link is created even though its parent is inherited from AR

Answer 1

Returns:
Undefined property: app\models\Foo::$option

All right. You've set the link to Bar, not Foo.
The child gets access to all parent implementations. The parent does not receive anything from the heir.
I will add that this is not Yii2, this is the basics of OO programming. Read a few books, otherwise it will be difficult for you to work with him.

Answer 2

The connection is formed by the attributes of the model. Most likely, in your BAR model, the ID attribute (or what do you have?) is not defined, according to which the binding is carried out.
Show the complete initialization code of the Bar model and also what you have in hasOne(...)