Yii2 before save check if attributes are changed

Question

I want to check if some attributes in my model are changed in beforeSave() method according to data stored in database.

Is there some best practice to check if model has changed?

My goal si to make history. If some attribute changes, I save a copy into model_history table.

Answer 1

You can actually do that using afterSave() .

public function afterSave($insert, $changedAttributes) {
    parent::afterSave($insert, $changedAttributes);
    if(!$insert) {
        // your code here like $changedAttributes['myField'];
    }
}

$changedAttributes saves the values of the attributes that were changed.

Answer 2

You need to check for dirty attributes

You can call yii\\db\\ActiveRecord::getDirtyAttributes() to get the attributes that are currently dirty.

http://www.yiiframework.com/doc-2.0/guide-db-active-record.html#dirty-attributes

Answer 3

You must be careful,by use dirtyAttributes property because yii, consider the following: before myfield type int =4 after myfield type string = "4" if it happens myfield will be into dirtyAttributes automatically.

Other point: For your dirtyAttributes your fields should be "safeAttributes" in the scenario where you are going to work, in other way this changes will be ignored

regards