mongoose, mongodb, nodejs nested schema

  var Likes = new Schema({
    like_id: ObjectId,
    name: String,
    date_liked: Date,
  });
  exports.Likes = mongoose.model('Likes', Likes);

  var Comments = new Schema({
    comment_id: ObjectId,
    user: String,
    user_photo: String,
    body: String,
    date_commented: Date,
  });
  exports.Comments = mongoose.model('Comments', Comments);

  var schema = new Schema({
    code_id: ObjectId,
    body: String,
    lang: String,
    filter: String,
    title: String,
    date: Date,
    submitted_by: String,
    submitted_by_photo: String
    , likes: [Likes],
    comments: [Comments]
  });