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node.js - TypeError：无法设置 null - 节点和 Mongoose 的属性“brief_title”

问题描述

我有一个使用 Node/Express/Mongo 的应用程序，当我想编辑文档时遇到了麻烦。我可以毫无问题地添加文档，但是当我构建编辑表单时，标题中出现错误。我也可以获取文档并查看我输入的信息。问题是当我尝试保存所做的任何更改时。

这是我的编辑功能：错误发生在 FindByIdAndUpdate 方法中的brief.brief_title = updated_brief_title 处。

 exports.postEditBrief = (req, res, next) => {
    const briefId = req.body.briefId;
    const updated_brief_title = req.body.brief_title;
    const updated_country = req.body.country;
    const updated_psg = req.body.psg;
    const updated_one_year_withholding = req.body.one_year_withholding;
    const updated_withholding_only = req.body.withholding_only;
    const updated_practice_advisory = req.body.practice_advisory;
    const updated_courthouse = req.body.courthouse;
    const updated_pages = req.body.pages;
    const updated_additional_psg = req.body.additional_psg;
    const updated_gangs = req.body.gangs;
    const updated_gang_name = req.body.gang_name;
    const updated_link = req.body.link;

Brief.findByIdAndUpdate(briefId)
  .then(brief => {
    brief.brief_title = updated_brief_title;
    brief.country = updated_country;
    brief.psg = updated_psg;
    brief.one_year_withholding = updated_one_year_withholding;
    brief.withholding_only = updated_withholding_only;
    brief.practice_advisory = updated_practice_advisory;
    brief.courthouse = updated_courthouse;
    brief.pages = updated_pages;
    brief.additional_psg = updated_additional_psg;
    brief.gangs = updated_gangs;
    brief.gang_name = updated_gang_name;
    brief.link = updated_link;
    return brief.save();
  })
  .then(result => {
      console.log(Brief);
  res.redirect('/');
})
.catch(err => console.log(err)); 
};

我在 Mongoose 中尝试过各种“查找和更新”方法，但结果是一样的。

标签： node.jsapimongooseejs

解决方案

您需要创建一个object要更新的数据并将其作为函数中的第二个参数传递，当您执行此操作时，.then()它会为您获取您正在执行的操作的结果，并且您不需要在.save()内部调用它

正确的版本应该是这样的

exports.postEditBrief = (req, res, next) => {
    const briefId = req.body.briefId;
    let update = {
      brief_title: req.body.brief_title,
      country: req.body.country,
      psg: req.body.psg,
      one_year_withholding: req.body.one_year_withholding,
      withholding_only: req.body.withholding_only,
      practice_advisory: req.body.practice_advisory,
      courthouse: req.body.courthouse,
      pages: req.body.pages,
      additional_psg: req.body.additional_psg,
      gangs: req.body.gangs,
      gang_name: req.body.gang_name,
      link: req.body.link
    }

    Brief.findByIdAndUpdate(briefId, update)
      .then(result => {
        console.log(result);
        res.redirect('/');
      })
      .catch(err => console.log(err));
  };

您可以使用object destructuring.

更新：

如果您不想覆盖文档，则需要使用$setwithfindOneandUpdate

exports.postEditBrief = (req, res, next) => {
        const briefId = req.body.briefId;
        let update = {
          brief_title: req.body.brief_title,
          country: req.body.country,
          psg: req.body.psg,
          one_year_withholding: req.body.one_year_withholding,
          withholding_only: req.body.withholding_only,
          practice_advisory: req.body.practice_advisory,
          courthouse: req.body.courthouse,
          pages: req.body.pages,
          additional_psg: req.body.additional_psg,
          gangs: req.body.gangs,
          gang_name: req.body.gang_name,
          link: req.body.link
        }
    
        Brief.findOneAndUpdate(briefId, {$set:update})
          .then(result => {
            console.log(result);
            res.redirect('/');
          })
          .catch(err => console.log(err));
      };

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