Modified UserIdentity.php from Yii2 template, to use session instead of token, and reduce connection to database

UserIdentity.php

<?php

namespace app\models;

class UserIdentity extends \yii\base\BaseObject implements \yii\web\IdentityInterface
{
    public $id;
    public $username;
    public $password;
    public $authKey;
    public $accessToken;
    public $idOrg; // company ID
    public $idBranch; // branch ID
    public $idProfile; // profile ID
    public $profileType; // profile type

    public $idBidang;
    public $idSection;

    public $activeUser = null;

    private static $users = []; // change, using database and session

    /* create array for user identity data
    // input : either User database, or froom this database
    // --- if $self is true, $obj is UserIdentity, else $obj is database model of User class
    */
    public static function getUserIdentityArray($obj,$self = false)
    {
      if ($obj  != null) {
        if ($self) {
          $user = ['id' => $obj->id, 'username' => $obj->username, 'idOrg' => $obj->idOrg, 'idProfile' => $obj->idProfile, 'profileType' => $obj->profileType, 'password' => $obj->password, 'authKey' => '', 'accessToken' => '', 'idBranch' => $obj->idBranch, 'idBidang' => $obj->idBidang, 'idSection' => $obj->idSection];
        }
        else {
          //$user = ['id' => $obj->id, 'username' => $obj->user_name, 'idOrg' => $obj->id_company, 'idProfile' => $obj->id_profile, 'profileType' => $obj->profileType, 'password' => $obj->pwd, 'authKey' => '', 'accessToken' => '', 'idBranch' => $obj->id_branch, 'idBidang' => $obj->id_bidang, 'idSection' => $obj->id_section];
          $user = ['id' => $obj->id, 'username' => $obj->user_name, 'idOrg' => $obj->id_company, 'idProfile' => $obj->id_profile, 'profileType' => $obj->profileType, 'password' => $obj->pwd, 'authKey' => '', 'accessToken' => '', 'idBranch' => $obj->id_branch];
        }
        return $user;
      }
      return null;
    }

    /**
     * find identity using ID
     */
    public static function findIdentity($id)
    {
      if ($id != '')
      {
        /*
        $data = User::findOne($id);
        if ($data) {
          $user = ['id' => $data->id, 'username' => $data->user_name, 'idOrg' => $data->id_company, 'password' => $data->pwd, 'authKey' => '', 'accessToken' => ''];

          return new static($user);
        }
        */
        $obj = \Yii::$app->session->get(\Yii::$app->params['userSession']);
        if ($obj) return new static (self::getUserIdentityArray($obj, true));
      }
      return null;
      //  return isset(self::$users[$id]) ? new static(self::$users[$id]) : null;
    }

    /**
     * find identity using TOKEN
     */
    public static function findIdentityByAccessToken($token, $type = null)
    {
      /*
        foreach (self::$users as $user) {
            if ($user['accessToken'] === $token) {
                return new static($user);
            }
        }
        */
        // need to change using database
        return null;
    }

    /**
     * Finds user by username
     *
     * @param  string      $username
     * @return static|null
     */
    public static function findByUsername($username)
    {
        /*
        foreach (self::$users as $user) {
            if (strcasecmp($user['username'], $username) === 0) {
                return new static($user);
            }
        }
        */

        // change using database
        // check session first
        $obj = \Yii::$app->session->get(\Yii::$app->params['userSession']);
        if ($obj) {
          return new static (self::getUserIdentityArray($obj,true));
        }

        // not in session, get database
        $data = User::find()->where(['user_name'=>$username, 'status'=>'active'])->one();
        if ($data)
        {
          return new static (self::getUserIdentityArray($data,false));
        }

        return null;
    }

    /**
     * @inheritdoc
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * @inheritdoc
     */
    public function getIdOrg()
    {
        return $this->idOrg;
    }

    /**
     * @inheritdoc
     */
    public function getIdProfile()
    {
        return $this->idProfile;
    }

    /**
     * @inheritdoc
     */
    public function getIdBidang()
    {
        return $this->idBidang;
    }

    /**
     * @inheritdoc
     */
    public function getAuthKey()
    {
        return $this->authKey;
    }

    /**
     * @inheritdoc
     */
    public function validateAuthKey($authKey)
    {
        return $this->authKey === $authKey;
    }

    /**
     * Validates password
     *
     * @param  string  $password password to validate
     * @return boolean if password provided is valid for current user
     */
    public function validatePassword($password)
    {
        return $this->password === md5($password);
    }
}