使用POSTMAN发布数据后未获取数据

这是我的nodejs代码，在这里我逐步注释掉我对代码所做的事情，现在我将使用POSTMAN发布数据

   exports.votes = async (req, res, next) => {
  try {
    /**
     * 1. get the poll from db
     * 2. check if the user already exists in any option
     * 3. if user has already selected any option do nothing
     * 4. if user has selected any other option remove from that option
     * 5. if user does not exist in any option, insert his user id to selected option
     */
    const { pollId } = req.params;
    console.log(pollId);
    let { userId, answer } = req.body;
    console.log(userId);
    console.log(answer);
    // get selected poll from db
    const poll = await Poll.findByIdAndUpdate(pollId, {
  $set: { options: poll.options },
}, {new: true});
    if (answer && poll) {
      answer = answer.toLowerCase();
      ///Finf the Poll

      let existingVote = null;
      Object.keys(poll.options).forEach((option) => {
        // loop on all options, check if the user already exists in any option
        if (poll.options[option].indexOf(userId) !== -1) {
          existingVote = option;
  
        }
      });
      if (existingVote == null) {
        // if there is no existing vote save it to db
        try {
          const push = {};
          push[`options.${answer}`] = userId;
          const update = await Poll.findByIdAndUpdate(
            pollId,
            { $push: push },
            { upsert: true }
          );
          res.status(201).json(update);
        } catch (err) {
          error.status = 400;
          next(error);
        }
      } else if (existingVote && existingVote.length > 0) {
        // check if answer is same as previous, if yes send not modified
        if (existingVote.toLowerCase() === answer.toLowerCase()) {
          res.status(304).send("Response already saved");
        } else {
          // delete the previous response and save it in new
          if (
            Array.isArray(poll.options[existingVote]) &&
            poll.options[existingVote].length > 0
          ) {
            // TODO: filtering this is not returning array but 1
            poll.options[existingVote] = poll.options[existingVote].filter(
              (vote) => vote != userId
            );
            poll.options[answer] = poll.options[answer].push(userId);
            const update = await Poll.findByIdAndUpdate(pollId, {
              $set: { options: poll.options },
            });
            res.status(201).json(update);
          }
        }
      } else {
        error = {
          status: 500,
          message: "Something went wrong",
        };
        next(error);
      }
    } else {
      error = {
        status: 404,
        message: "Poll not found",
      };
      next(error);
    }
  } catch (error) {
    error.status = 400;
    next(error);
  }
};

但是每当我通过POSTMAN发布数据时，什么都没得到-在这里您可以看到我将数据发布到mongodb中，而在这里什么也没有得到，我发布了{userId，answer}之类的数据，但是得到了空数组。

但是当我检查我的ROBO-3T数据库时-我正在获取数据->

我的问题是，为什么在将数据获取到数据库而不是POSTMAN结果时会出现这种情况？请帮忙

还我收到这样的警告- （节点：8776）DeprecationWarning：猫鼬：findOneAndUpdate()并findOneAndDelete()没有useFindAndModify选项设置为false已被弃用。请参阅：https：//mongoosejs.com/docs/deprecations.html#findandmodify