Current File : /var/www/html/geotechnics/api/vendor/spatie/laravel-permission/docs/advanced-usage/extending.md
---
title: Extending
weight: 3
---
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
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
In BOTH cases, whether extending or replacing, you will need to specify your new models in the configuration. To do this you must update the `models.role` and `models.permission` values in the configuration file after publishing the configuration with this command:
```bash
php artisan vendor:publish --provider="Spatie\Permission\PermissionServiceProvider" --tag="config"
```
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