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# Overriding models
When you are creating application with Yii2-user you can find that you need to override models or forms. This guide
describes how you can override any model used by Yii2-user. Moreover you can attach any behavior or event handler to any
model. This is possible because Yii2-user uses [Dependency Injection container](https://github.com/yiisoft/yii2/blob/master/docs/guide/concept-di-container.md).
Assume you decided to override user class and change registration process. Let’s create new user class under `@app/models`.
```php
namespace app\models;
use dektrium\user\models\User as BaseUser;
class User extends BaseUser
{
public function register()
{
// do your magic
}
}
```
In order to make Yii2-user use your class you need to configure module as follows:
```php
...
'user' => [
'class' => 'dektrium\user\Module',
'modelMap' => [
'User' => 'app\models\User',
],
],
...
```
## Attaching behaviors and event handlers
Yii2-user allows you to attach behavior or event handler to any model. To do this you can set model map like so:
```php
[
...
'user' => [
'class' => 'dektrium\user\Module',
'modelMap' => [
'User' => [
'class' => 'app\models\User',
'on user_create_init' => function () {
// do you magic
},
'as foo' => [
'class' => 'Foo',
],
],
],
],
...
]
```