貓鼬.find（）在沒有匹配結果的情況下返回200響應和空數組

Question

我試圖通過在發送響應之前檢查查詢是否返回了某些內容來為查詢添加一層驗證。 我的問題是，當我用Postman進行測試時，即使我的收藏集中根本沒有記錄，我也會收到200響應並返回一個空數組。

router.get(
  "/",
  passport.authenticate("jwt", { session: false }),
  (req, res) => {
    const errors = {};
    Appointment.find({ user: req.user.id })
      .populate("user", ["firstName", "lastName", "email", "phone"])
      .then(appointments => {
        if (!appointments) {
          // if the user id is not there, or if the appointments array is empty
          errors.noappointments = "You do not have any appointments booked";
          return res.status(404).json(errors);
        }
        res.json(appointments);
      })
      .catch(err => res.status(404).json(err));
  }
);

Answer 1

看來您期待一個real承諾。 exec給您 ：

router.get(
  "/",
  passport.authenticate("jwt", { session: false }),
  (req, res) => {
    const errors = {};
    Appointment.find({ user: req.user.id })
      .populate("user", ["firstName", "lastName", "email", "phone"])
      .exec()
      .then(appointments => {
        if (!appointments.length) {
          // if the user id is not there, or if the appointments array is empty
          errors.noappointments = "You do not have any appointments booked";
          return res.status(404).json(errors);
        }
        res.json(appointments);
      })
      .catch(err => res.status(404).json(err));
  }
);

看看這是否行得通。