How to add relational model when inserting model in yii2?

Question

Yii

Such a problem.
It is necessary to make sure that when One is inserted into the database, Two is also added. And the one received from Two->id has been upgraded to One->two_id.
It is impossible to take out the code outside the class!

/**
* @property int      $id
* @property string $field
* @property int      $two_id
*
* @property Two $two
*/
class One
{
    // необходимо добавить $this->two_id. но добавить изнутри
    // $Two = new Two();
    // $Two->fied = $this->field;
    // $Two->insert();
    // $this->two_id = $Two->id;
}

/**
* @property int $id
* @property string $field
*/
class Two
{

}

$One = new One();
$One->field = 'blablabla';
$One->insert();

Answer 1

You are now moving in the wrong direction, why do you need to create and bind objects inside the model? this is a direct path to bad code. In fact, this is all a piece of business logic. And the business logic, as you know, should not be stored in ActiveRecord (I understand that you are using it), it should be stored in a separate class.
PS You can link these two records using link()