models.js

var Mongoose = require('mongoose');

var UserSchema = new Mongoose.Schema({
  // fields are defined here
  "name":     String,
  "username": {type: String,  unique : true},
  "password": String,
  "email":    String,
  "imageURL": String
});
exports.User = Mongoose.model('User', UserSchema);



var QuestSchema = new Mongoose.Schema({
  "title":        String,
  "description":  String,
  "level":        Number,
  "deadline":     Date,
  "takenBy":      {type: Mongoose.Schema.Types.ObjectId,  ref: 'User', default: new Mongoose.Types.ObjectId},
  "completed":    Boolean,
  "index":        Number
});
exports.Quest = Mongoose.model('Quest', QuestSchema);



var ItemSchema = new Mongoose.Schema({
  "name": String
});
exports.Item = Mongoose.model('Item', ItemSchema);



var GameSchema = new Mongoose.Schema({
  "castleHealth":   Number,
  "monsterHealth":  Number,
  "items":          [{type: Mongoose.Schema.Types.ObjectId,  ref: 'Item', default: new Mongoose.Types.ObjectId}]
});
exports.Game = Mongoose.model('Game', GameSchema);



var CastleSchema = new Mongoose.Schema({
  "name":     {type: String,  unique : true},
  "admin":    {type: Mongoose.Schema.Types.ObjectId,  ref: 'User', default: new Mongoose.Types.ObjectId},
  "members": [{type: Mongoose.Schema.Types.ObjectId,  ref: 'User', default: new Mongoose.Types.ObjectId}],
  "quests":  [{type: Mongoose.Schema.Types.ObjectId,  ref: 'Quest', default: new Mongoose.Types.ObjectId}],
  "game":     {type: Mongoose.Schema.Types.ObjectId,  ref: 'Game', default: new Mongoose.Types.ObjectId}
});
exports.Castle = Mongoose.model('Castle', CastleSchema);