### How to filter the options in a select field

This also applies to: select2, select2_multiple, select2_from_ajax, select2_from_ajax_multiple.

There are 3 possible solutions:
1. If there will be few options (dozens), the easiest way would be to use ```select_from_array``` or ```select2_from_array``` instead. Since you tell it what the options are, you can do any filtering you want there.
2. If there are a lot of options (100+), best to use ```select2_from_ajax``` instead. You'll be able to filter the results any way you want in the controller method (the one that responds with the results to the AJAX call).
3. If you can't use ```select2_from_array``` for ```select2_from_ajax```, you can create another model and add a global scope to it. For example, say you only want to show the users that belong to the user's company. You can create ```App\Models\CompanyUser``` and use that in your ```select2``` field instead of ```App\Models\User```:

```php
<?php

namespace App\Models;

use App\User;
use Auth;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Builder;

class CompanyUser extends User
{
    /**
     * The "booting" method of the model.
     *
     * @return void
     */
    protected static function boot()
    {
        parent::boot();

        // never let a company user see the users of other companies
        if (Auth::check() && Auth::user()->company_id) {
            $companyId = Auth::user()->company->id;

            static::addGlobalScope('company_id', function (Builder $builder) use ($companyId) {
                $builder->where('company_id', $companyId);
            });
        }
    }
}
```