README

Here’s a README in English for your Yii2 behavior code:

Model Attribute Event Behavior for Yii2

A behavior for Yii2 ActiveRecord that triggers custom methods when specific model attributes are changed. Useful for handling attribute-specific logic after insert/update operations.

Installation

Place the ModelAttributeEventBehaviour class in your project (e.g., under components/behaviors). Ensure the namespace matches your project structure.

Usage

1. Extend the Behavior: Create a new class inheriting from ModelAttributeEventBehaviour.
2. Attach to Model: Attach the behavior to your ActiveRecord model.
3. Define Handlers: Implement methods in the format onChange{AttributeName} or onInsert{AttributeName} to handle attribute changes.

Example

Step 1: Create a Custom Behavior Class

namespace app\components\behaviors;

class MyEventBehavior extends \carono\yii2\behaviors\ModelAttributeEventBehaviour
{
    public function onChangeStatusId($event, $insert, $model, $value, $oldValue, $changedAttributes)
    {
        // Triggered when `status_id` changes
        if (!$insert && $oldValue != $value) {
            // Custom logic here (e.g., send notification, log change)
        }
    }

    public function onInsertEmail($event, $insert, $model, $value, $oldValue, $changedAttributes)
    {
        // Triggered when `email` is set during model creation
        if ($insert) {
            // Custom logic for new email
        }
    }
}

Step 2: Attach to Your Model

namespace app\models;

use yii\db\ActiveRecord;
use app\components\behaviors\MyEventBehavior;

class User extends ActiveRecord
{
    public function behaviors()
    {
        return [
            MyEventBehavior::class,
        ];
    }
}

Method Parameters

Handler methods receive the following arguments:

• $event: The AfterSaveEvent object.
• $insert: Boolean indicating if the model was just inserted.
• $model: The ActiveRecord model instance.
• $value: New value of the attribute.
• $oldValue: Old value of the attribute.
• $changedAttributes: Array of all changed attributes and their old values (as in $event->changedAttributes).

Events

• After Insert: Triggers methods prefixed with onInsert (e.g., onInsertEmail for the email attribute).
• After Update: Triggers methods prefixed with onChange (e.g., onChangeStatusId for the status_id attribute).

Important Notes

• The $changedAttributes array contains the old values of changed attributes.
• Handlers are only triggered if the attribute value actually changes (as detected by Yii2’s dirty attributes).
• The behavior automatically binds to the EVENT_AFTER_INSERT and EVENT_AFTER_UPDATE events.

License

MIT