[英]Error in function to update an user [node.js]
当我尝试使用邮递员更新用户的个人简介时出现错误。 我使用 mongoDB 作为数据库。 当我尝试在响应中发送文档时,这似乎是一个问题,但我不知道如何解决它
这是不起作用的 userController 代码:
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 }); } };
错误如下:
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...
您正在回调函数中发送响应,但是一旦承诺解决(等待),响应就已经发送。
尝试使用 -
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 });
}
};
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