Node reading string as object

Question

I have this code:

<a class="btn-primary btn" href="/employer/booth/<%= user._id.toString() %>"
        <% console.log(typeof user._id, user._id) %>
   target="_blank">
    Preview your booth
</a>

The result of this console.log is this: object 5bc9d28270e5375dfbfe17fd

Why? Why is a generic _id created with passport treated as an object when it's clearly a string?

I tried doing .toString(), but this caused another error in my router. Here's the code:

router.get('/booth/:emp_id', async (req, res, next) => {
    const mongoose = require('mongoose');
    // For reports
    const {emp_id} = req.params;
    console.log('here', emp_id);
    console.log(typeof  emp_id);
    console.log(JSON.stringify(emp_id));
    const eventId = await GeneralInfo.findOne().then(r => r.activeEventId).catch(e => console.log(e));
    const event = await Event.findById(eventId).catch(e => console.log(e));
    Event.updateOne({'attendants.employers.id': mongoose.Types.ObjectId(emp_id)}, {$addToSet: {"attendants.employers.$.boothVisits": req.user._id}}, {$upsert: true}).catch(e => console.log(e));
    var postings = await Posting.find({
        'creatorId': emp_id,
        'visible': true,
        'eventId': eventId,
    }).catch(e => console.log(e));
    const acc = await Account.findById(emp_id);
    // const logo = await functions.downloadFile(req, res);
    const logo = await functions.downloadFile(acc.employer.logo);
    console.log(logo);
    res.render('users/employer/booth', {
        title: 'Employer Booth',
        user: req.user,
        postings: postings,
        employer: acc,
        event: event,
        logo: logo,
    });
});

If I do this, so pass a string I get this:

(node:15508) UnhandledPromiseRejectionWarning: Error: Argument passed in must be a single String of 12 bytes or a string of 24 hex characters
at new ObjectID (/home/alex/Documents/Projects/ontario-job-portal/node_modules/mongodb-core/node_modules/bson/lib/bson/objectid.js:57:11)
at ObjectID [as ObjectId] (/home/alex/Documents/Projects/ontario-job-portal/node_modules/mongodb-core/node_modules/bson/lib/bson/objectid.js:38:43)
at router.get (/home/alex/Documents/Projects/ontario-job-portal/routes/employer.js:68:68)
at <anonymous>

Because for some reason, req.params.emp_id is [object Object]. If I try to JSON.stringify I get "[object Object]", so that's extremely unhelpful.

Here's the _id field from mongoDB

"_id": {
    "$oid": "5bc9d28270e5375dfbfe17fd"
},

So how can I pass the _id of a user as a string?

Georgy · Accepted Answer · 2018-11-08 18:52:59Z

1

To get hexadecimal representation of id you can use .valueOf(). More methods and examples here: https://docs.mongodb.com/manual/reference/method/ObjectId.valueOf/#ObjectId.valueOf

answered Nov 8, 2018 at 18:52

Georgy

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