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title: Extending
weight: 3
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## Extending User Models
Laravel's authorization features are available in models which implement the `Illuminate\Foundation\Auth\Access\Authorizable` trait. By default Laravel does this in `\App\User` by extending `Illuminate\Foundation\Auth\User`, in which the trait and `Illuminate\Contracts\Auth\Access\Authorizable` contract are declared.
If you are creating your own User models and wish Authorization features to be available, you need to implement `Illuminate\Contracts\Auth\Access\Authorizable` in one of those ways as well.
## Extending Role and Permission Models
If you are extending or replacing the role/permission models, you will need to specify your new models in this package's `config/permissions.php` file.
First be sure that you've published the configuration file (see the Installation instructions), and edit it to update the `models.role` and `models.permission` values to point to your new models.
Note the following requirements when extending/replacing the models:
### Extending
If you need to EXTEND the existing `Role` or `Permission` models note that:
- Your `Role` model needs to extend the `Spatie\Permission\Models\Role` model
- Your `Permission` model needs to extend the `Spatie\Permission\Models\Permission` model
### Replacing
If you need to REPLACE the existing `Role` or `Permission` models you need to keep the following things in mind:
- Your `Role` model needs to implement the `Spatie\Permission\Contracts\Role` contract
- Your `Permission` model needs to implement the `Spatie\Permission\Contracts\Permission` contract
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