使用 mongoose 从 mongodb 获取 object

Question

The problem is probably simple, but my 2 AM brain can't understand what's going on anymore. I'm trying to create a profile page that shows basic public info. The way I'm trying to make it work is pulling out the users username from mongodb when registered the account by his specific _id. If needed, verification I use is JWT.

app.post('/api/user-profile', async (req,res) => {
  const { token } = req.body

  if(!token) {
      return res.json({ status: 'error', error: 'not logged in' })
  }

  try {
      const user = jwt.verify(token, JWT_SECRET)
      const userid = user.id
   
      const result = User.findOne({ userid })

      console.log(result)
      // return res.json({ status: 'ok', name: result })
  } catch(error) {
      // return res.json({ status: 'error', error: 'something went wrong' })
      console.log(error)
  }
})

I'm not sure what function should I use, findOne() or findById() . I tried to look at the documentation at mongoose, but the explanation is a bit too hard for me to understand.

PS User = the user registration model. If needed I can paste in the code.

Answer 1

I don't have a lot of experience with mongoose but worked with Mongo quite a lot. findOne is a direct correspondent of Mongo's findOne function which receives a query in the format {"key": "expectedValue"}. If you want to use it to get data by id the query is {"_id": user.id}.

Because fetching data by id is a common case, the lib added the method findByID which receives an ID, and then formats the query and makes an internal call to findOne.

Answer 2

use findById instead of findOne if userid is _id and use await before the query, so do like this:

const result = await User.findById(userid)

if you want to use findOne:

const result = await User.findOne({"_id" : userid})

if you want a plain object javascript use .toObject after query like this:

const result = await User.findById(userid).toObject()
console.log(result)

Answer 3

For anyone interested, the answer is just like Mohammad Yaser Ahmadi said. Everything works fine, and by getting the username I did:

const user = jwt.verify(token, JWT_SECRET)
const userid = user.id

const result = await User.findById(userid)

const usersName = result.username

console.log(usersName)