将 ActiveRecord 属性映射到 Yii2 中的 PHP 类

Question

Prehistory:

I have Microsoft SQL Server as DBMS behind my Yii2 REST API. SQL Server has its internal data types: geography and geometry . Techincally, in terms of PDO, these types are PHP binary strings

Question:

So, i need a transparent way to map columns of these types to my class MyApp\\Geometry , for example. That is i should be able to:

1. access ActiveRecord instance property as Geometry instance(eg $model->geometryBorders->someGeometryTransformation();
2. save ActiveRecord instance with Geometry property transformation by __toString() method

As of the second point - it looks clear for me ( as far, as i understand, PDO engine automatically converts all values to PHP string type before sending them to DBMS), but about the first point - i do not know how to implement it within the Yii2 architecture

So, are there any way to map ActiveRecord attribute to PHP class? I belive, that someone has already met this problem before.

Answer 1

You may use afterFind() method or afterFind event to userialize object from DB.

public function afterFind() {
    parent::afterFind();
    $this->geometryBordersObject = Geometry::fromString($this->geometryBorders);
}

And reverse operation before saving ( beforeSave() method or beforeInsert and beforeUpdate events):

public function beforeSave() {
    $this->geometryBorders = $this->geometryBordersObject->toString();

    return parent::beforeSave();
}

You may also try using getters and setters to provide virtual attributes, but it may be tricky with object.