Module.php

<?php

namespace artkost\qa;

use yii\base\InvalidCallException;
use yii\helpers\Url;
use Yii;

/**
 * This is the main module class for the QA module.
 *
 * To use QA, include it as a module in the application configuration like the following:
 *
 * ~~~
 * return [
 *     ......
 *     'modules' => [
 *         'qa' => ['class' => 'artkost\qa\Module'],
 *     ],
 * ]
 * ~~~
 *
 * With the above configuration, you will be able to access QA Module in your browser using
 * the URL `http://localhost/path/to/index.php?r=qa`
 *
 * If your application enables [[UrlManager::enablePrettyUrl|pretty URLs]] and you have defined
 * custom URL rules or enabled [[UrlManager::enableStrictParsing], you may need to add
 * the following URL rules at the beginning of your URL rule set in your application configuration
 * in order to access QA:
 *
 * ~~~
 * 'rules' => [
 *     'qa' => 'qa',
 *     'qa/<controller>' => 'qa/<controller>',
 *     'qa/<controller>/<action>' => 'qa/<controller>/<action>',
 *     ...
 * ],
 * ~~~
 *
 * You can then access QA via URL: `http://localhost/path/to/index.php/qa`
 *
 * @author Nikolay Kostyurin <nikolay@artkost.ru>
 * @since 2.0
 */
class Module extends \yii\base\Module
{
    /**
     * @inheritdoc
     */
    public $controllerNamespace = '\artkost\qa\controllers';

    /**
     * User model class
     * @var string
     */
    public $userClass = '\app\models\User';

    /**
     * Formatter function name in user model, or callable
     * @var string|callable
     */
    public $userNameFormatter = 'getId';

    public function init()
    {
        parent::init();

        $i18n = Yii::$app->i18n;

        if (!isset($i18n->translations['artkost\qa'])) {
            $i18n->translations['artkost\qa'] = [
                'class' => 'yii\i18n\PhpMessageSource',
                'sourceLanguage' => 'en',
                'basePath' => '@artkost/qa/messages',
            ];
        }
    }

    /**
     * Alias function for [[Yii::t()]]
     * @param $message
     * @param array $params
     * @param null $language
     * @return string
     */
    public static function t($message, $params = [], $language = null)
    {
        return Yii::t('artkost\qa', $message, $params, $language);
    }

    /**
     * Alias function for [[Url::toRoute()]]
     * @param $route
     * @param bool $scheme
     * @return string
     */
    public static function url($route, $scheme = false)
    {
        return Url::toRoute($route, $scheme);
    }

    /**
     * @param \app\models\User $model
     * @return string
     * @throws InvalidCallException
     */
    public function getUserName($model)
    {
        //if (method_exists($model, $this->userNameFormatter)) {
            return call_user_func([$model, $this->userNameFormatter]);
        //} else throw new InvalidCallException('Invalid userNameFormatter function');
    }

    /**
     * Check if is given user unique
     */
    public function isUserUnique()
    {
        return !Yii::$app->user->isGuest;
    }

}