'uniqueViolated' error type when inserting the same record more than once

When inserting the same record in a database more than once I expect different unique keys to be associated to them, and the resulting database to have one record for every time I’ve inserted the record.

This is not happening though. The sample code below:

var async = require('async'),
    Nedb = require('nedb'),
    path = require('path'),
    db = new Nedb({ filename: path.join(__dirname, 'foobar.db'), autoload: true });

var record = { 'foo': 'bar' };

async.eachSeries([0, 1, 2, 3, 4], function (recordNo, callback) {
    console.log("Inserting record no. " + recordNo);
    db.insert(record, function (err) {
        if (err) console.log(err);
        callback(err);
    });
}, function (err) {
    console.log("Done");
});

has as output:

$ node test3.js --test 
Inserting record no. 0
Inserting record no. 1
{ message: 'Can\'t insert key mHJCoBF42NffD0jy, it violates the unique constraint',
  key: 'mHJCoBF42NffD0jy',
  errorType: 'uniqueViolated' }
Done
$ 

foobar.db is:

{"foo":"bar","_id":"mHJCoBF42NffD0jy"}

Am I missing something? I can’t be the first person to do something like this. Thanks.

G.

[obinetbits]

You must have objects in your database, and not simple type such as string or number. Otherwise, you will end up with this error:

{ message: ‘Can't insert key undefined, it violates the unique constraint’, key: undefined, errorType: ‘uniqueViolated’ }

because every record needs a _id properly (generated by the NeDB), so if you don’t have an object, it cannot add the _id property.

for more details see “Where are my data ?” section on http://ctheu.com/2015/02/09/a-journey-through-the-creation-of-an-app-with-node-mongodb-react-gulp/

[mcallan83]

I had this issue as well. I was about to post here asking for updates, but realized I had set a unique index on a field, but the objects I was upserting did not contain that property.

This caused the first record to be inserted, because the unique field had a value of undefined, but the next records would not insert because they had the same values for the unique field.