Mongoose - detect duplicated fields

Question

I have user schema with 2 unique fields(email and username) and when i try to create new user with duplicated field I have that error

{
  "error": {
    "code": 11000,
    "index": 0,
    "errmsg": "E11000 duplicate key error collection: InstaClone.users index: email_1 dup key: { : \"baidario.ua@gmail.com\" }",
    "op": {
      "hashedPassword": "$2a$10$eaMym5AMibJlGOSBV3/DHOXPhSoMMDTNwxGcSOn4tEPg07htyQ2Ey",
      "email": "baidario.ua@gmail.com",
      "username": "baidario",
      "fullName": "Roman Baida",
      "_id": "58d3a8acdc57641e30e9027a",
      "created": "2017-03-23T10:50:49.188Z",
      "__v": 0
    }
  }
}

How I can get duplicated filed name? Only way I see is to parse errmsg field. Maybe someone know better way?

before inserting the new user, just run a query like db.users.find({$or: [{"username": username}, {"email": email}}). if it does return a document, then username or email are already present in db — felix, Mar 23 '17 at 11:14
@felix that solution has a race-condition, in which a new user could get created between the time the `find()` returns and the `create()` is executed (resulting in the duplicate key error). — robertklep, Mar 23 '17 at 11:17

score 3 · Accepted Answer · answered Mar 23 '17 at 11:19

3

To customize error returned from mongoose unique validation you can use package called: mongoose-beautiful-unique-validation

https://www.npmjs.com/package/mongoose-beautiful-unique-validation

answered Mar 23 '17 at 11:19

kaxi1993

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Alternatively, see [this answer](http://stackoverflow.com/a/30594137/893780) on how to "catch" E11000 errors. – robertklep Mar 23 '17 at 11:20

Mongoose - detect duplicated fields

1 Answers1