更新用戶的功能錯誤[node.js]

當我嘗試使用郵遞員更新用戶的個人簡介時出現錯誤。我使用 mongoDB 作為資料庫。當我嘗試在回應中發送檔案時，這似乎是一個問題，但我不知道如何解決它

這是不起作用的 userController 代碼：

module.exports.updateUser = async (req, res) => {
    if (!ObjectId.isValid(req.params.id))
      return res.status(404).send("ID unknown : "   req.params.id);
  
    try {
      await UserModel.findOneAndUpdate(
        { _id: req.params.id },
        {
          $set: {
            bio: req.body.bio,
          },
        },
        { new: true, upsert: true, setDefaultsOnInsert: true },
        (err, docs) => {
            console.log(docs);
            if (!err) return res.send(docs);
            else return res.status(500).json({ message: err });
        }
      );
    } catch (err) {
      return res.status(500).json({ message: err });
    }
};

錯誤如下：

node:events:371
      throw er; // Unhandled 'error' event
      ^

Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client
    at new NodeError (node:internal/errors:371:5)
    at ServerResponse.setHeader (node:_http_outgoing:573:11)
    at ServerResponse.header (/home/pt/Documents/back_sport_app/api/node_modules/express/lib/response.js:771:10)
    at ServerResponse.send (/home/pt/Documents/back_sport_app/api/node_modules/express/lib/response.js:170:12)
    at ServerResponse.json (/home/pt/Documents/back_sport_app/api/node_modules/express/lib/response.js:267:15)
    at ServerResponse.send (/home/pt/Documents/back_sport_app/api/node_modules/express/lib/response.js:158:21)
    at /home/pt/Documents/back_sport_app/api/controllers/userController.js:36:34
    at /home/pt/Documents/back_sport_app/api/node_modules/mongoose/lib/model.js:4923:18
    at processTicksAndRejections (node:internal/process/task_queues:78:11)
Emitted 'error' event on Function instance at:
    at /home/pt/Documents/back_sport_app/api/node_modules/mongoose/lib/model.js:4925:15
    at processTicksAndRejections (node:internal/process/task_queues:78:11) {
  code: 'ERR_HTTP_HEADERS_SENT'
}
[nodemon] app crashed - waiting for file changes before starting...

uj5u.com熱心網友回復：

您正在回呼函式中發送回應，但是一旦承諾解決（等待），回應就已經發送。

嘗試使用 -

module.exports.updateUser = async (req, res) => {
   if (!ObjectId.isValid(req.params.id))
     return res.status(404).send("ID unknown : "   req.params.id);
 
   try {
      const docs = await new Promise((resolve, reject) => {
         UserModel.findOneAndUpdate(
            { _id: req.params.id },
            {
               $set: {
               bio: req.body.bio,
               },
            },
            { new: true, upsert: true, setDefaultsOnInsert: true },
            (err, docs) => {
               if (err) {
                  reject(err)
               } else {
                  console.log(docs);
                  resolve(docs)  // resolving the promise with docs, instead of sending the response.
               }
            }
         );
      })

      return res.send(docs);  // sending response after the above promise is resolved.
   } catch (err) {
     return res.status(500).json({ message: err });
   }
};

標籤：javascript 节点.js MongoDB 猫鼬

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