public void init(NutConfig config) {
CommonMongoService commons = config.getIoc().get(CommonMongoService.class, "commons");
MongoDao dao = commons.dao();
//初始化集合
dao.create(User.class, false);
dao.create(Question.class, false);
dao.create(Answer.class, false);
dao.create(SystemConfig.class, false);
dao.create(App.class, false);
dao.create(Role.class, false);