node.js – NodeJS Passport：通过两种策略进行多重登录 – 序列化问题

passport.use(new InstagramStrategy({
    clientID: global.INSTAGRAM_CLIENT_ID,clientSecret: global.INSTAGRAM_CLIENT_SECRET,callBACkURL: "http://**.**.**.**:3000/auth/instagram/callBACk"
  },function(accessToken,refreshToken,profile,donE) {
    process.nextTick(function () {
        console.log('Access token: ' + accessToken);
        global.access_token = accessToken;
      return done(null,profilE);
    });
  }
));

passport.use(new LocalStrategy(
    function(email,password,donE) {
    console.log('chec user');
    process.nextTick(function() {
        db.findByEmail(email,function(err,user) {
            if (!user) {
                console.log('UnkNown user ' + email);
                return done(null,false,{
                    message: 'UnkNown user ' + email
                });
            }
            if (user.password != crypt.getMD5fromString(password)) {
                console.log('Invalid password');
                return done(null,{
                    message: 'Invalid password'
                });
            }
            return done(null,user);
        })
    });
}));

但是我的自定义序列化和deserialize函数不适用于Instagram策略：

/* these FUNCTIONS WORK WITH INSTAGRAM STRATEGY
passport.serializeUser(function(user,donE) {
  done(null,user);
});

passport.deserializeUser(function(obj,obj);
});*/

    /*these ARE FOR LOCAL STRATEGY*/
passport.serializeUser(function(user,donE) {done(null,user._id);});
passport.deserializeUser(function(id,donE) {db.findById(id,user) {done(err,user);});});

如何避免这个bug？我的目标 – 提供登录Instagram,并在成功登录检查后 – 如果用户有本地帐户(通过电子邮件或Instagram昵称),从数据库获取数据.虽然用户应该能够通过本地策略在没有Instagram的情况下登录.谢谢.