猫鼬中用户之间的友好关系简单

Question

嗨，有人可以向我解释如何在mongoose中写一个简单的友谊关系

var mongoose = require('mongoose'),
Schema = mongoose.Schema;

var User = new Schema({

username:{
    type: String,
    unique: true,
    required: true
},
password:{
    type: String,
    required: true
},
friends:{[

    // stuck here How would i define what another user is here
]}
}

});

Answer 1

friends: [{type: Schema.ObjectId, ref: "User"}]