Yii2 call method/function of a different model

Question

I have a method/function of a virtual attribute in Model1:

class Model1 {
    public $virtattr;
    public $_virtattr;

    public function getVirtattr () {
        if (isset($this->_virtattr)) {
            return $this->_virtattr;
        }

        return $this->_virtattr = str_ireplace('x1', 'x2', $this->virtattr);
    }
}

How can I call this method in Model2 to get the same result? I was trying it this way but unfortunately it's not working, 'cause I'm getting empty results:

use Model1;

class Model2 {
    public $virtattr;
    public $_virtattr;

    public function getVirtattr () {
        return (new Model1)->getVirtattr();
    }
}

Can you please point me to the right direction?

But how do I'm getting empty result then...? I can't use `Model1::getVirtattr();` because it's not a static — user2511599, Nov 07 '18 at 15:11
why you defined $virtattr variable when you defined getVirtattr function? — Abolfazl Sharifi, Nov 07 '18 at 20:52
It looks like you need to learn some OOP basics. You should probably take a look at traits: http://php.net/manual/en/language.oop5.traits.php — rob006, Nov 08 '18 at 00:09
Definitely! I never said I shouldn't :D Thanks for the tip, I've never really met with traits regarding yii. I'm going to check it. — user2511599, Nov 08 '18 at 06:27
based on this I've managed to make it work! https://stackoverflow.com/questions/34649600/how-to-write-trait-in-yii2 Thank you! Would you answer me to be able to accept? — user2511599, Nov 08 '18 at 06:46

score 0 · Accepted Answer · answered Nov 08 '18 at 12:46

The point of object programming is encapsulation - Model1 will not magically use properties from Model2 just because you instantiated Model1 inside of Model2. Model1 will use its own properties so (new Model1())->getVirtattr() will not touch properties from Model2.

If you want to share the same logic between two classes, you may use inheritance:

class Model1 {

    public $virtattr;
    public $_virtattr;

    public function getVirtattr() {
        if ($this->_virtattr !== null) {
            return $this->_virtattr;
        }

        return $this->_virtattr = str_ireplace('x1', 'x2', $this->virtattr);
    }
}

class Model2 extends Model1 {

}

Then Model1::getVirtattr() and Model2::getVirtattr() will use the same implementation.

If inheritance is not possible/preferred, you may use traits to share the same implementation between two separate classes:

trait VirtattrTrait {

    public $virtattr;
    public $_virtattr;

    public function getVirtattr() {
        if ($this->_virtattr !== null) {
            return $this->_virtattr;
        }

        return $this->_virtattr = str_ireplace('x1', 'x2', $this->virtattr);
    }
}

class Model1 {

    use VirtattrTrait;
}

class Model2 {

    use VirtattrTrait;
}

Yii2 call method/function of a different model

1 Answers1