Javascript Mongoose仅在文档值已定义时更新文档值

我只想更新文档中新定义的值。如果未定义，请保留文档中的值。下面的例子

如果数据库中存在此文档

{
  "_id": "592c53b3bdf350ce004ad717",
  "url": "hyoh7ryb-",
  "fname": "Foo",
  "lname": "Bar",
  "email": "foobar@gmail.com",
  "__v": 0,
  "verfied": false,
  "bio": {
    "title": "Software Engineer",
    "intro": "I like to code stuff.",
    "summary": "Specializing in web development. Favorite language is Javascript.\n"
  }
}

我的代码：

module.exports.updateBio = function(req, res) {


    var userID = req.params.id;
    var objForUpdate = {bio: {}};

    if (!app.isEmptyString(req.body.profile_picture)) objForUpdate.bio.profile_picture = req.body.profile_picture;
    if (!app.isEmptyString(req.body.title))           objForUpdate.bio.title = req.body.title;
    if (!app.isEmptyString(req.body.intro))           objForUpdate.bio.intro = req.body.intro;
    if (!app.isEmptyString(req.body.summary))         objForUpdate.bio.summary = req.body.summary;   
    if (!app.isEmptyString(req.body.skills))          objForUpdate.bio.skills = req.body.skills;
    if (!app.isEmptyString(req.body.facebook))        objForUpdate.bio.social.facebook = req.body.facebook;
    if (!app.isEmptyString(req.body.twitter))         objForUpdate.bio.social.twitter = req.body.twitter;
    if (!app.isEmptyString(req.body.linkedin))        objForUpdate.bio.social.linkedin = req.body.linkedin;
    if (!app.isEmptyString(req.body.website))         objForUpdate.bio.social.website = req.body.website;

    var conditions = { _id: userID }
      , setObj = { $set: objForUpdate }
      , options = { multi: true };

    Profile.update(conditions, setObj, (error, page) =>{
        if(error) return res.status(500).json({ success: false, error: error });

        res.status(200).json({ success: true, message: "Bio successfully updated." });
    });
};

在我的body send请求中，我只更新标题，但我想保留所有其他生物信息，但它会为它们创建一个空白字段

---

如何处理此问题？

您应该修改$set运算符，如下所示：

$set: {
  'bio.title' : 'someinfo'
}

当你说：

var objForUpdate = {bio: {}};

---

这基本上意味着删除bio对象内的所有属性。

嵌套对象（如bio）的设置语法为：

$set:{'bio.profile_picture'：20}

所以试试这个：

module.exports.updateBio = function(req, res) {


    var userID = req.params.id;
    var objForUpdate = {};

    if (!troolr.isEmptyString(req.body.profile_picture)) objForUpdate['bio.profile_picture'] = req.body.profile_picture;
    if (!troolr.isEmptyString(req.body.title))           objForUpdate['bio.title'] = req.body.title;
    if (!troolr.isEmptyString(req.body.intro))           objForUpdate['bio.intro'] = req.body.intro;
    if (!troolr.isEmptyString(req.body.summary))         objForUpdate['bio.summary'] = req.body.summary;   
    if (!troolr.isEmptyString(req.body.skills))          objForUpdate['bio.skills'] = req.body.skills;
    if (!troolr.isEmptyString(req.body.facebook))        objForUpdate['bio.social.facebook'] = req.body.facebook;
    if (!troolr.isEmptyString(req.body.twitter))         objForUpdate['bio.social.twitter'] = req.body.twitter;
    if (!troolr.isEmptyString(req.body.linkedin))        objForUpdate['bio.social.linkedin'] = req.body.linkedin;
    if (!troolr.isEmptyString(req.body.website))         objForUpdate['bio.social.website'] = req.body.website;

    var conditions = { _id: userID }
      , setObj = { $set: objForUpdate }
      , options = { multi: true };

    Profile.update(conditions, setObj, (error, page) =>{
        if(error) return res.status(500).json({ success: false, error: error });

        res.status(200).json({ success: true, message: "Bio successfully updated." });
    });
};