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How to automate timestamps in ActiveRecord models

Revision #9 has been created by Maurizio Domba Cerin on Jun 17, 2011, 10:16:17 AM with the memo:

changed text to mention Gii instead of yiic, and explained better the beforeSave() variant
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How to automate timestamps in ActiveRecord models

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There are dozens ofmany ways to automate the setting of timestamps in yii ActiveRecord models. Two ways you can dof thisem are: 1. Via rules() 2. Via beforeSave() To start off we need to create a database table.

`modified` datetime NOT NULL,
Following this we'll gener
After we have the table we need to cre
ate thea model with the Yii shell tool:
    model Node Nodes
To create the crud functionality we need to type this:
    crud Node
and CRUD for it by using Gii.
Check the guide on [How to generate model and CRUD with Gii](http://www.yiiframework.com/doc/guide/1.1/en/quickstart.first-app#implementing-crud-operations "How to generate model and CRUD with Gii").

The first way you can do it is via your model's rules. Here is an example.
if ($this->isNewRecord)
$this->created = new CDbExpression('NOW()');
else $this->modified = new CDbExpression('NOW()'); return parent::beforeSave(); } Note that in the above code, when creating a new record only the 'created' field will be assigned/updated, while the 'modified' record will be assigned/updated only when updating an existing record.
If you want to assign/update the 'modified' field even when creating a new record... use this code:
public function beforeSave() {
if ($this->isNewRecord)
$this->created = new CDbExpression('NOW()');
$this->modified = new CDbExpression('NOW()');

return parent::beforeSave();
These are simple and elegant solutions to this issue.
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Version: 1.1
Category: Tutorials
Written by: dalip
Last updated by: Yang He
Created on: Feb 14, 2009
Last updated: 5 years ago
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