const AV = require('../lib/av-live-query-weapp-min'); class Class extends AV.Object{ get name(){ return this.get("name"); } set name(value){ this.set("name", value); } get students(){ return this.get("students"); } add_student(user){ this.addUnique("students", user.id); } del_student(user){ let students = this.get("students"); if(user.id in students){ this.remove(user.id); } } }