anchor.diff:  
     var pinGoogleOAuth = new PinGoogleOAuth.fromJson(oauth['web']);
     var pinGoogleDrive = new PinGoogleDrive(pinGoogleOAuth);
  +
  +  //-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
  +  //-* Initialize database models
  +  //-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
  +  CartModel.instance;
   
     bool isSignedIn(HttpContext ctx) {
       bool signedIn = true;
  
positive.code: 
  main() {
  
    PinUtility.setCwdToRoot('../..');
  
    Map setting = PinUtility.readJsonFileSync('config/setting.json');
    Map oauth = PinUtility.readJsonFileSync('config/oauth.json');
    Map credentials = PinUtility.readJsonFileSync(oauth['web']['credentialsFilePath']);
  
negative.code: 
    var app = new Express();
  
    //-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
    //-* ROUTERS
    //-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
    app.get('/oauth2', (HttpContext ctx) {
      ctx.res.redirect(Uri.parse(pinGoogleOAuth.getOAuthUrl()));
    });
  