I am saving data into a MongoDB. The data will be saved into 3 Mongoose models that are hierarchical. A User model contains an Activity model array. An Activity model contains an array of Data models. Are the following model definitions correct (or does an explicit reference to the parent model need to be declared)?

I will add any additional details if need be.


var userSchema = new mongoose.Schema({
    googleId: {type: String, unique: true, required: true},
    name: {type: String, required: true},
    data: [{ type: mongoose.Schema.Types.ObjectId, ref: 'Activity' }]

module.exports = mongoose.model('User', userSchema);


module.exports = mongoose.model('Activity', {

    name: String,
    data: [{ type: mongoose.Schema.Types.ObjectId, ref: 'Data' }]


module.exports = mongoose.model('Data', {

    date: String,
    time: {type: Number, default: 0},
    timestamp: {type: Number, default: 0}

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