如何使用 Node js 和 MongoDB 关联两个模型？

Question

So i'm making a simple game store like steam, i have a user model and a games model, i need to make a games library and have each user have their own library with games they choose from the store, how do i make it so when a user chooses a game that game is saved into their library using Node js and MongoDB?

Answer 1

You can create an array of games in user model and whenever user add a game, the id of that game will be stored in the user model. And then you can retrieve the data by using that id.

Answer 2

If you have a Game and a User model, you can simply create an array of references to the Game model inside the User model. Like this:-

User.js

const userSchema = mongoose.Schema({
  // Other user stuff
  games = [{
    type : mongoose.Schema.Types.ObjectId,
    ref : 'Game'
  }]
});

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

Game.js

const gameSchema = mongoose.Schema({
  // Other game fields
  users = [{
    type : mongoose.Schema.Types.ObjectId,
    ref : 'User'
  }]
});

module.exports = mongoose.model('Game', gameSchema);

Thereafter, you can simple push a game document to a user document using user.games.push(game)

Make sure that your 'ref' field has the same name as the model of the object you want to refer to.