Yii2 afterSave. Using changedAttributes show error

Question

I have this weird error in my Yii2 Model's AfterSave Function

When I do this

public function afterSave($insert, $changedAttributes) {
    parent::afterSave($insert, $changedAttributes);
    if(!$insert):
        print_r($changedAttributes);exit;
        $this->prepareMail(self::MAIL_APPROVE);
    ;
}

I get

Array ( 
 [reason_for_travel] => 1 [project_id] => [billable] => 1  
 [advance_required] => 0 [status] => 2  ) // See it contains 'status'

But when i do this

public function afterSave($insert, $changedAttributes) {
    parent::afterSave($insert, $changedAttributes);
    if(!$insert):
        $status = $changedAttributes['status']; // this line shows error
        if($status == Self::STATUS_CONFIRMED):
           $this->prepareMail(self::MAIL_APPROVE);
        ;
    ;
}

$status = $changedAttributes['status']; This line shows error

Error is "Undefined index: status"

What am I not seeing ?

@InsaneSkull Error : "Trying to get property of non-object". Also Doc says its array. — ck_arjun, Mar 02 '16 at 06:53
Yes , error text implies what you are saying. But when i print it out , array has the index 'status' . When i remove the exit point and use the value , issue arise. !!!!! — ck_arjun, Mar 02 '16 at 07:08
What version of php are you using? That code gives a syntax error on 7. — topher, Mar 02 '16 at 07:40
is it possible that afterSave() is called multiple times? once without status? — Pomme.Verte, Mar 03 '16 at 16:42
@D.Mill Though i found a workaround and completed the task. I checked the code again after seeing your comment. And you are right about it. save() is called again inside afterSave() which in turns calls afterSave() , this time without 'status'. Thanks , wont make the mistake next time ;) — ck_arjun, Mar 04 '16 at 09:38

score 3 · Answer 1 · answered Aug 04 '16 at 21:25

use this lines:

if(!$insert):
  $status = isset($changedAttributes['status']) ? $changedAttributes['status'] : 0); // this line shows error
    if($status == Self::STATUS_CONFIRMED):
       $this->prepareMail(self::MAIL_APPROVE);
    ;
;

$changedAttributes contains the old values of the modified fields but only modified fields, valid if exist with "isset" skip errors.

score 0 · Answer 2 · answered Oct 01 '21 at 10:27

How to check is an attribute has changed after saving

public function afterSave($insert, $changedAttributes){
    //isAttributeChangedAfterSave
    var_dump(array_key_exists('name', $changedAttributes) && $this->name != $changedAttributes['name']);

    //...
}

Note that isAttributeChanged() does not work in afterSave() because after saving, $this->oldAttributes is assigned new values.

Yii2 afterSave. Using changedAttributes show error

2 Answers2

Linked