twoSchemas.js

// User
// ====
var UserSchema = mongoose.Schema({
	username: String,
	email: String,
	salt: String,
	hashed_password: String,
	orgas: [{type: mongoose.Schema.ObjectId, ref: 'Organization'}]
});

// [...] all kind of User methods like:
UserSchema.virtual('id')
.get(function() {
	return this._id.toHexString();
});

// Organization
// ============
var OrganizationSchema = mongoose.Schema({
	name: String,
	members: [{type: mongoose.Schema.ObjectId, ref: 'User'}],
});

exports.User         = mongoose.model('User', UserSchema);
exports.Organization = mongoose.model('Organization', OrganizationSchema);