Define permissions for columns and fields in the backend

This feature is available in Core starting from Build 460: https://github.com/octobercms/october/pull/4520

Create a trait that extends the controller and form fields.

traits/ColumnFieldPermissions.php

trait ColumnFieldPermissions
{
    public function formExtendFields($form, $fields)
    {
        foreach ($fields as $name => $field) {
            $permissionValue = array_get($field->config, 'permission');
            if ($permissionValue && !$this->user->hasAccess($permissionValue)) {
                if (array_get($field->config, 'permissionReadOnly')) {
                    $field->readOnly = true;
                    $field->disabled = true;
                } else {
                    $form->removeField($name);
                }
            }
        }
    }

    public function listExtendColumns($list)
    {
        foreach ($list->columns as $name => $column) {
            $permissionValue = array_get($column, 'permission');
            if ($permissionValue && !$this->user->hasAccess($permissionValue)) {
                $list->removeColumn($name);
            }
        }
    }
}

Example of usage

use Samuell\Plugin\Traits\ColumnFieldPermissions;

class YourController extends Controller
{
    use ColumnFieldPermissions;

    ....
}

Then we can use it in columns or fields like

name:
    permission: my.custom.permission