Yii2 TimeStamp Behavior

Yii 2.0 General Discussions
1

Okay, sooo, i always like to know when my records are created and when they are updated. ROR provides this by default for example, by updating the created_at and updated_at field.

So i have very many model classes,so i created an AppModel.php and made all the other model classes extend it…and then defined


use yii\behaviors\TimestampBehavior;


public function behaviors()

{

    return [

        TimestampBehavior::className(),

    ];

}

This seemed to work fine, but it sets the updated_at and created_at as 0000-00-00 00:00:00

So i went ahead and changed it to


<?php


namespace frontend\models;


use Yii;

use yii\behaviors\TimestampBehavior;

use yii\db\Expression;

/*All Models are going to extend this class

  It has the behaviors method,which will be used for the created_at and updated_at

  Trying to emphasize DRY(Don't Repeat Yourself)	

*/

 class AppModel extends \yii\db\ActiveRecord

 {

 	public function behaviors()

 	{

 		return [

 			'class' => TimestampBehavior::className(),

 			'value' => new Expression('NOW()') 			

 		];

 	}


 }

Which when i created the first record, it worked fine.

Now when i try to access all my records, i get an error, like in the attachment

Then it goes ahead to complain about the search model class, like in the second attachment.

What am i missing?

2

After doing more research, turns out… i needed this


 public function behaviors()

    {

        return [

            'timestamp' => [

                'class' => 'yii\behaviors\TimestampBehavior',

                'attributes' => [

                    ActiveRecord::EVENT_BEFORE_INSERT => ['created_at', 'updated_at'],

                    ActiveRecord::EVENT_BEFORE_UPDATE => ['updated_at'],

                ],

                'value' => new Expression('NOW()'),

            ],           

        ];

     }

Sooo…there is this link to the api, which suggested the first approach, which failed…

The one which worked is this one from the guide.

3

The problem in you second block of code was that you omitted one level of array (square brackets). This should work:


public function behaviors()

{

    return [

        [

            'class' => TimestampBehavior::className(),

            'value' => new Expression('NOW()'),

        ],

    ];

}