Question

我想将“ displayTitle”更新为“ 12345”，其中objectId为topten =“ 50000以下”的“ title”下的“ 5d8c8f4a4449a851f6kkk6o2”。findOneAndUpdate用于具有两个条件的数组的嵌套对象元素，首先用于选择特定文档，第二个在嵌套数组中查找特定对象。集合名称是：topten。

> db.topten.find().pretty();
{
    "_id" : ObjectId("5d8c8f254449a851f6aaa6r3"),
    "title" : "under 50000",
    "products" : [
        {
            "_id" : ObjectId("5d8c8f4a4449a851f6kkk6o2"),
            "productId" : "5cfe541ae759d9699b5213542",
            "displayTitle" : "dhtyks",
            "score" : 100,
            "priority" : 50,
            "description" : "Upcoming"
        },
        {
            "_id" : ObjectId("5d8c8f8f4449a86544646"),
            "productId" : "5cfe512bca044365efsdfgg45",
            "displayTitle" : "Spice",
            "score" : 10,
            "priority" : 800,
            "description" : "Advanced"
        }
    ],
    "created" : ISODate("2019-09-26T10:12:53.804Z"),
    "updated" : ISODate("2019-10-03T05:24:19.296Z"),
    "slug" : "under-10000",
    "__v" : 0
{
    "_id" : ObjectId("5d8c8f254449a851f6ddd9a1"),
    "title" : "under 10000",
    "products" : [
        {
            "_id" : ObjectId("5d8c8f4a4449a851f6ddd9a2"),
            "productId" : "5cfe541ae759d9699b56759b",
            "displayTitle" : "ABCDEF6",
            "score" : 10,
            "priority" : 200,
            "description" : "New Gen"
        },
        {
            "_id" : ObjectId("5d8c8f8f4449a851f6ddd9a4"),
            "productId" : "5cfe512bca044365ef1dcd0f",
            "displayTitle" : "Micromax",
            "score" : 1,
            "priority" : 200,
            "description" : "Upcoming"
        }
    ],
    "created" : ISODate("2019-09-26T10:12:53.804Z"),
    "updated" : ISODate("2019-10-03T05:24:19.296Z"),
    "slug" : "under-10000",
    "__v" : 0

我正在使用的代码是：

topten.findOneAndUpdate({"title" : "under 50000",  "products": { $elemMatch: { "_id": "5d8c8f4a4449a851f6kkk6o2" } }},
                    {"products.0.displayTitle":"12345"},
                        function (err, doc) {
                        if (err) {
                            console.log(err);
                             reject(new Error(err));
                            return;
                        } else {
                            console.log('AAAAAAAAAAAAAAAAAAAAAAAA', doc)
                                                       res.status(200)
                                .json({
                                    success: true,
                                    msg: 'Attached product updated succesfully`);'
                                })

                        }
                    }
                )

查询正在运行，但没有更新我的Db中的值。请帮助，我被困在这里。

Answer 1

尝试在分配产品的地方使用$set。0.displayTitle如下所示：

   topten.findOneAndUpdate(
        {"title" : "under 50000",  
        "products": { $elemMatch: { "_id": "5d8c8f4a4449a851f6kkk6o2" } }},
          {$set: { products.0.displayTitle: "12345"}},
          function (err, doc) {
          if (err) {
              console.log(err);
               reject(new Error(err));
              return;
          } else {
              console.log('AAAAAAAAAAAAAAAAAAAAAAAA', doc)
                                         res.status(200)
                  .json({
                      success: true,
                      msg: 'Attached product updated succesfully`);'
                  })

          }
      }
  )

findOneAndUpdate用于具有两个条件的数组的嵌套对象元素

1 个答案: