Nodejs + mongodb + dynamic $set without declaring a variable

Question

I have been using this method to update the object dynamically, is there any way I can do this without setting up a variable like I do with query?

This is what I am currently using:

var query = {}
query["settings.panels."+req.params.type+"."+req.params.id] = req.body

mongoPool.collection('settings').updateOne(
    {_id: req.user.profile.id},
    { 
      $set: query,
    (err, doc) => {
    if (!err) {
      res.status(200).send({ errorStatus: false, returnData: doc }
    } else {
    console.log(err);
    res.status(200).send({ errorStatus: true, errorMsg: 'Db Error',   errorCode: 405 })
    }
})

This is what I want:

mongoPool.collection('settings').updateOne(
    {_id: req.user.profile.id},
    { 
      //notice I didnt use query & this returns an array
      $set: ["settings.panels."+req.params.type+"."+req.params.id] : req.body
    }, (err, doc) => {
    if (!err) {
      res.status(200).send({ errorStatus: false, returnData: doc }
    } else {
    console.log(err);
    res.status(200).send({ errorStatus: true, errorMsg: 'Db Error',   errorCode: 405 })
    }
})

Instead it returns an array

No, that is not possible.

Thomas Bormans
– Thomas Bormans

2015-11-15 13:28:05 +00:00
Commented Nov 15, 2015 at 13:28 — Thomas Bormans
– Thomas Bormans, Commented Nov 15, 2015 at 13:28

JohnnyHK · Accepted Answer · 2015-11-15 16:12:24Z

2

As long as you're using Node.js 4.x or above, you can use its ES6 support for computed property names to do this:

mongoPool.collection('settings').updateOne(
    {_id: req.user.profile.id},
    { 
      $set: { ["settings.panels."+req.params.type+"."+req.params.id]: req.body }
    },
    (err, doc) => {
      if (!err) {
        res.status(200).send({ errorStatus: false, returnData: doc }
      } else {
        console.log(err);
        res.status(200).send({ errorStatus: true, errorMsg: 'Db Error',   errorCode: 405 })
      }
    }
)

edited Nov 15, 2015 at 16:12

answered Nov 15, 2015 at 15:09

JohnnyHK

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