reddit评论系统如何在mongodb / nodejs中复制

如何在MongoDB / mongoose中创build嵌套的评论回复，以便像在reddit嵌套中一样创build评论系统。 这是我迄今创build的模式：

var CommentSchema = Schema({ body: {type: String}, chapterId: {type: RK, ref: 'Chapter'}, by: {type: RK, ref: 'User'}, }, {timestamps: true}); var UserSchema = new Schema({ name: String, username: {type:String, unique: true}, profile_pic: String, password: String, role:{type: [{ type: String, enum: ['user', 'admin'] }], default: ['user'] } });