使用猫鼬更新MongoDB数组中的对象

Question

我试图更新文档中的数组内的对象。对象不是子文档，因此没有唯一的ID。我尝试过看各种方法来做到这一点，但它似乎没有任何效果（如在，什么也没有发生 - 没有错误，但文件不更新）

可能更容易显示。代码首先，这里在此集合中文档的例子：

{ 
    _id: 123, 
    //other fields go here 
    submissions: [ 
     { 
      submission: 1, 
      downloaded: null, //This should be an ISODate when populated 
      assessor: null, //This should be an ObjectID when populated 
      feedbackUploaded: null, //This should also be an ISODate 
      path: '401Test1.doc', 
      assessorNotes: null //This should be a string when populated 
     }, 
     { 
      submission: 2, 
      downloaded: null, 
      assessor: null, 
      feedbackUploaded: null, 
      path: '401Test2.doc', 
      assessorNotes: null 
     } 
    ] 
} 

现在我的猫鼬查询（特快航线内）：

const unit = req.body.unit; //e.g. 123 
const submission = req.body.submission // e.g. 2 
const date = Date.now(); 

Unit.update({ "_id": unit, "submissions.submission": submission }, { 
     $set: { 
      'submissions.assessorNotes': req.body.assessorComments, 
      'submissions.feedbackUploaded': date, 
      'submissions.assessor': req.body.assessor 
     }, function(err){ 
      //callback 
     } 
    }) 

我也试着在此使用$符号$set命令即'submissions.$.assessorNotes': req.body.assessorComments'，但这似乎并不奏效。

我哪里错了？

干杯！

Chris

Answer 1

刚刚用TomG在shell中提到的位置运算符进行了测试。

> db.foo.find().pretty() 
{ 
    "_id" : 123, 
    "submissions" : [ 
     { 
      "submission" : 1, 
      "downloaded" : null, 
      "assessor" : null, 
      "feedbackUploaded" : null, 
      "path" : "401Test1.doc", 
      "assessorNotes" : null 
     }, 
     { 
      "submission" : 2, 
      "downloaded" : null, 
      "assessor" : null, 
      "feedbackUploaded" : null, 
      "path" : "401Test2.doc", 
      "assessorNotes" : null 
     } 
    ] 
} 

然后我跑了update命令：

db.foo.update(
    { _id: 123, "submissions.submission": 2 }, 
    { $set: { 
    "submissions.$.assessorNotes": "testAssessorNotes", 
    "submissions.$.feedbackUploaded": new Date(), 
    "submissions.$.assessor": "testAssessor" 
    } } 
) 

结果如下：

{ 
    "_id" : 123, 
    "submissions" : [ 
     { 
      "submission" : 1, 
      "downloaded" : null, 
      "assessor" : null, 
      "feedbackUploaded" : null, 
      "path" : "401Test1.doc", 
      "assessorNotes" : null 
     }, 
     { 
      "submission" : 2, 
      "downloaded" : null, 
      "assessor" : "testAssessor", 
      "feedbackUploaded" : ISODate("2016-10-26T15:33:09.573Z"), 
      "path" : "401Test2.doc", 
      "assessorNotes" : "testAssessorNotes" 
     } 
    ] 
} 

编辑：我的直觉是，错误也可能是与猫鼬的更新，您可以尝试将两者都更改为位置操作员，如果它符合您的需要而不是更新，则可以使用findOneAndUpdate。

请尝试此查询的猫鼬：

Unit.update(
    { "_id": unit, "submissions.submission": submission }, 
    { $set: { 
     'submissions.$.assessorNotes': req.body.assessorComments, 
     'submissions.$.feedbackUploaded': date, 
     'submissions.$.assessor': req.body.assessor 
    } }, function(err, result) { 
     //callback 
    } 
});