Yii2 TimestampBehavior not working correctly - php

Question

I am using most recent version of Yii framework (2.0.6). I have table Post with PostModel and in my model I need to set correctly created_at and updated_at properties. As soon as I create new Post, both values are set to current timestamp, but when I update this post, it will also update both attributes in table to current time, even though only updated_at should be updated and created_at should remain the same.
use yii\behaviors\TimestampBehavior;
public function behaviors() {
return [
[
'class' => TimestampBehavior::className(),
],
[
'class' => SluggableBehavior::className(),
'attribute' => 'name',
],
];
}
This is the other version, but still not working:
public function behaviors()
{
return [
'timestamp' => [
'class' => TimestampBehavior::className(),
'attributes' => [
\yii\db\ActiveRecord::EVENT_BEFORE_INSERT => ['created_at', 'updated_at'],
\yii\db\ActiveRecord::EVENT_BEFORE_UPDATE => ['updated_at'],
],
],
[
'class' => SluggableBehavior::className(),
'attribute' => 'title',
],
];
}
I am also using MariaDB database. If you could help me, what is going on with my code, I will appreciate it very much.

Answer 1

First of all, the second snippet is not correct, because attributes array is not designed to be set by user. It's kind of inner logic, you only need to set createdAtAttribute and updatedAtAttribute properties. Accordingly they are named created_at and updated_at by default, so if your naming is the same, you can just omit this declaration as you did in first snippet.
It's better to explicitly add this too:
use yii\db\Expression;
...
`value` => new Expression('NOW()'),
To prevent changing created_at column value during update, you can add DEFAULT CURRENT_TIMESTAMP.
Here is snippet from migration:
use yii\db\Schema;
...
'created_at' => Schema::TYPE_TIMESTAMP . ' NOT NULL DEFAULT CURRENT_TIMESTAMP',
'updated_at' => Schema::TYPE_TIMESTAMP . ' NOT NULL',
See this related question for more details.
It's for MySQL, but I guess for MariaDB is the same or very similar.