Mongoose 返回 "new ObjectId("//id")" 而不仅仅是 id

Question

我正在尝试执行我的登录功能（我正在使用 bcrypt 和 jsonwebtoken）问题是 console.log (user._id) 返回我 "new ObjectId (" 6148f043ebbaa0ab41ac8499 ")" 而不仅仅是 "6148f043ebbaa0ab41ac8499" ，创建令牌会更容易。

  module.exports.login = async (req, res) => {
     const { email, password } = req.body;
    
      // Compare the req.body.password to the hashed password in DB
      const user = await UserModel.findOne({ email: email });
      const match = await bcrypt.compare(password, user.password);
    
      if (match) {
        try {
          const user = await UserModel.findOne({ email: email });
          console.log(user._id);
    
          // Assign a token
          const token = jwt.sign({ userId: user._id }, process.env.LOGIN_TOKEN, {
            expiresIn: "1h",
          });
          console.log(token);
          res.cookie("jwt", token, { httpOnly: true});
          res.status(200).json({ user: user._id });
        } catch (err) {
          res.status(500).json(err);
        }
      } else {
        res.status(500).json({ message: "error!!!" });
      }
    };

请问如何解决？

Answer 1

这是正常行为。既然你有一个ObjectId，你可以通过调用toHexString() 方法将其转换为字符串。我还修改了代码以检查未定义的用户，并删除了查找用户的额外调用，因为您已经在上一行中做了。请查看更新代码：

module.exports.login = async (req, res) => {
  const { email, password } = req.body;
   const user = await UserModel.findOne({ email: email });

   if (!user) {
     return res.status(400).json({ message: "Unauthorised"});
   }
 
   // Compare the req.body.password to the hashed password in DB
   const match = await bcrypt.compare(password, user.password);
 
   if (match) {
     try {
      //  Convert user id (ObjectId) to a string
       const userId = user._id.toHexString();
      //  Now user id is a string
       console.log(userId);
 
       // Assign a token
       const token = jwt.sign({ userId }, process.env.LOGIN_TOKEN, {
         expiresIn: "1h",
       });
       console.log(token);
       res.cookie("jwt", token, { httpOnly: true});
       res.status(200).json({ user });
     } catch (err) {
       res.status(500).json(err);
     }
   } else {
     res.status(400).json({ message: "Unauthorised" });
   }
 };