backend/controllers/SettingsController.php

<?php
    namespace backend\controllers;
    
    use common\models\Settings;
    use yii\base\InvalidConfigException;
    use yii\filters\AccessControl;
    use yii\web\Controller;
    use Yii;
    
    /**
     * Class SettingsController
     *
     * @package artbox\core\controllers
     */
    class SettingsController extends Controller
    {
        /**
         * @inheritdoc
         */
        public function behaviors()
        {
            return [
                'access' => [
                    'class' => AccessControl::className(),
                    'rules' => [
                        [
                            'actions' => [
                                'login',
                                'error',
                            ],
                            'allow'   => true,
                        ],
                        [
                            'actions' => [
                                'logout',
                                'index',
                            ],
                            'allow'   => true,
                            'roles'   => [ '@' ],
                        ],
                    ],
                ],
            ];
        }
        /**
         * @inheritdoc
         */
        public function getViewPath()
        {
            return \Yii::getAlias('@artbox/core/views/settings');
        }
    
        /**
         * Display site settings page
         *
         * @return string|\yii\web\Response
         */
        public function actionIndex()
        {
            $model = $this->findSettings();
            
            if ($model->load(Yii::$app->request->post()) && $model->save()) {
                Yii::$app->session->setFlash('success', 'Settings saved');
                
                return $this->goHome();
            }
            
            return $this->render(
                'settings',
                [
                    'model' => $model,
                ]
            );
        }
    
        /**
         * Find site settings
         *
         * @return \yii2tech\filedb\ActiveRecord
         * @throws \yii\base\InvalidConfigException
         */
        public function findSettings()
        {
            if ($model = Settings::find()
                                 ->one()
            ) {
                return $model;
            } else {
                throw new InvalidConfigException('Settings file not found');
            }
        }
    }