Question

我有一个MongoDB嵌入式文档，其中包含许多数组文档。

EX：

{
    "_id" : ObjectId("594b7b7d4064e264420e38d0"),
    "UnitId" : "594b75d44064e264420e3869",
    "UnitName" : "PARKING",
    "UnitIcon" : "./upload/file-1498117588607.jpg", 
    "Stream" : {
        "_id" : ObjectId("594b7b7d4064e264420e38d1"),
        "Types" : [ 
            {
                "TypeId" : "594b9a884064e264420e3b56",
                "TypeName" : "TR/RC",
                "Travel" : false
            }, 
            {
                "TypeId" : "594b9a844064e264420e3b55",
                "MaterialStreamName" : "RW",              
                "Travel_Required" : false
            }, 
            {
                "TypeId" : "594b9a9d4064e264420e3b58",
                "TypeName" : "ST",               
                "Travel_Required" : true
            }, 
            {
                "TypeId" : "594b9a764064e264420e3b53",
                "TypeName" : "FD",               
                "Travel_Required" : true
            }
        ]
    }   
},{
    "_id" : ObjectId("594b7b7d4064e264420e38d1"),
    "UnitId" : "594b75d44064e264420e3870",
    "UnitName" : "CAFE",
    "UnitIcon" : "./upload/file-1498117588608.jpg", 
    "Stream" : {
        "_id" : ObjectId("594b7b7d4064e264420e38d2"),
        "Types" : [ 
            {
                "TypeId" : "594b9a884064e264420e3b56",
                "TypeName" : "TR/RC",
                "Travel" : false
            }, 
            {
                "TypeId" : "594b9a844064e264420e3b55",
                "MaterialStreamName" : "RW",              
                "Travel_Required" : false
            }, 
            {
                "TypeId" : "594b9a9d4064e264420e3b58",
                "TypeName" : "ST",               
                "Travel_Required" : true
            }, 
            {
                "TypeId" : "594b9a764064e264420e3b53",
                "TypeName" : "FD",               
                "Travel_Required" : true
            }
        ]
    }   
},{
    "_id" : ObjectId("594b7b7d4064e264420e38d2"),
    "UnitId" : "594b75d44064e264420e3870",
    "UnitName" : "CAFE",
    "UnitIcon" : "./upload/file-1498117588608.jpg", 
    "Stream" : {
        "_id" : ObjectId("594b7b7d4064e264420e38d3"),
        "Types" : [                 
            {
                "TypeId" : "594b9a9d4064e264420e3b58",
                "TypeName" : "ST",               
                "Travel_Required" : true
            },     
            {
                    "TypeId" : "594b9a884064e264420e3b56",
                    "TypeName" : "TR/RC",
                    "Travel" : false
                }, 
                {
                    "TypeId" : "594b9a844064e264420e3b55",
                    "MaterialStreamName" : "RW",              
                    "Travel_Required" : false
                }, 
                {
                    "TypeId" : "594b9a764064e264420e3b53",
                    "TypeName" : "FD",               
                    "Travel_Required" : true
                }
            ]
        }   
    }

我有很多文件，包含UnitID和TypeID（在Types对象中）的组合。我必须通过匹配UnitId和TypeID删除该Type元素。我用过$ pull但没有实现。

    db.getCollection('units_details').update(
    { "UnitId" : "594b75d44064e264420e3870","Stream[0].Types.$.TypeID" : "594b9a884064e264420e3b56"    }, 
    { $pull: { "Stream[0].Types"            
                 "TypeId" : "594b9a884064e264420e3b56",
                        "TypeName" : "TR/RC",                            
                        "Travel" : false
          } }} ,{multi:true}

    );

如何实现删除类型数组中的类型，其中类型数组中的类型顺序正在发生变化。

Answer 1

您可以使用以下任一查询来查询嵌套数组。

db.getCollection('units_details').update(
  {"UnitId":"594b75d44064e264420e3870","Stream.Types.TypeId":"594b9a884064e264420e3b56"},
  {"$pull":{
    "Stream.$.Types":{
      "TypeId":"594b9a884064e264420e3b56",
      "TypeName":"TR/RC",
      "Travel":false}
  }},
  {"multi":true}
);

OR（更适用于多标准方案）

db.getCollection('units_details').update( {
    "UnitId":"594b75d44064e264420e3870",
    "Stream":{
      "$elemMatch":{
        "Types":{
          "$elemMatch":{"TypeId":"594b9a884064e264420e3b56"}
        }
      }
    }
  },
  {"$pull":{
    "Stream.$.Types":{
      "TypeId":"594b9a884064e264420e3b56",
      "TypeName":"TR/RC",
      "Travel":false}
  }},
  {"multi":true}
 )

如何在mongoDB中拉入嵌入文档中的特定元素

1 个答案: