Mongoose unique index on subdocument

Question

Let\'s say I have a simple schema:

var testSchema = new mongoose.Schema({
    map: { type: [ mongoose.Schema.Types.Mixed ], default: [] },
    ...possibly so         


        

Answer 1

First objectId length in mongodb must be 24. Then you can turn off _id, and rename _id as id or others,and try $addToSet. Good luck.

CoffeeScript example:

FromSchema = new Schema(
  source: { type: String, trim: true }
  version: String
  { _id: false }//to trun off _id
)

VisitorSchema = new Schema(
  id: { type: String, unique: true, trim: true }
  uids: [ { type: Number, unique: true} ]
  from: [ FromSchema ]
)

//to update
Visitor.findOneAndUpdate(
  { id: idfa }
  { $addToSet: { uids: uid, from: { source: source, version: version } } }
  { upsert: true }
  (err, visitor) ->
    //do stuff