如何在mongodb上更新

Question

我有收集，结构如下， 如何使用

更新 tags字段

_id: 556c1c836e80082821f41d9f

_versions.id: 556c1c836e80082821f41da6

_versions._data._id: 556c71735ddb5010067f1beb

[{
     "_id": ObjectId("556c1c836e80082821f41d9f");
     "_name": "Product 1"
     "_curr_version": ObjectId("556c1c836e80082821f41da6")
     "_versions": [{
         "_id": ObjectId("556c71735ddb5010067f1be6"),
         "_data": [{
                 "_id": ObjectId("556c1cae82b9a3101787d20f"),
                 "_tags": ['sport', 'football']
             }, {
                 "_id": ObjectId("556c71735ddb5010067f1beb"),
                 "tags": ['golf']
             }

         ]
     },

     {
         "_id": ObjectId("556c1c836e80082821f41da6"),
         "_data": [{
                 "_id": ObjectId("556c1cae82b9a3101787d20f"),
                 "_tags": ['sport', 'swimming']
             }, {
                 "_id": ObjectId("556c71735ddb5010067f1beb"),
                 "tags": ['tenis']
             }

         ]
     }

     ]

 }]

Answer 1

我在nodejs上工作，并使用mongosee驱动程序访问mongodb。我找到了解决方案。

• 在_versions._data._id: 556c71735ddb5010067f1beb位置存储为pos var
之前

• 之后我有：

  var ObjectId = require('mongoskin').ObjectID;
  var setObject = {};
  setObject["_versions.$._data."+ pos +"._tag"] = ['a','b'];
  db.use("MongoDB").collection('collections').update({
          "_id": new ObjectId('556c1c836e80082821f41d9f'),
          "_versions._id": new ObjectId('556c1c836e80082821f41da6')
      },
      {
          $set : setObject
      },
      {},
      cb);