# Allowed Fields

By default, Framework\Crud allows every database column and all model relations (that have a defined return type) to be filtered.

```php
// App\Models\User

public function posts(): Illuminate\Database\Eloquent\Relations\HasMany // This is mandatory
{
    return $this->hasMany(Post::class);
}
```

you can overwrite the allowed columns as follows:

```php
// App\Models\User

protected $filterFields = [
  'email',
  'mobile',
  'posts', // relation
];

protected $sortFields = [
  'name',
  'mobile',
];
```

any field other than email, mobile, or posts will be rejected when filtering.

## Overwrite Allowed Fields

to overwrite allowed fields in the controller add `filterFields` or `sortFields` before calling filter or sort method.

```php
Post::filterFields('title', 'created_at')->filter()->get();

Post::sortFields('created_at', 'updated_at')->sort()->get();
```

{% hint style="info" %}
filterFields and sortFields will overwrite fields defined in the model.
{% endhint %}


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