Big numbers break underscore.js _.contains
The last returns "3e+23" which is not equals to "300000000000000000000002"
The problem was always that I get an input String which is automatically converted to a number (by a library). So I only had to make the 'foreign key' a smaller number. I eventually created a custom number autogenerate function to circumvent this problem:
var autoIncrement = require('mongoose-auto-increment');var address = require('./Address');var connection = mongoose.createConnection(address.mongo());autoIncrement.initialize(connection);var UserSchema = new mongoose.Schema({ /* property definitions */});mongoose.model('User', UserSchema);UserSchema.plugin(autoIncrement.plugin, { model: 'User', startAt: 10000001});As a result, I had to change the referencing mechanism:
var GroupSchema = new mongoose.Schema({ users: [{type: Number, ref: 'User'}], /* other property definitions */});