不删除嵌入文档 mongo

Question

我有这个数据：

db.school.find({})

{ 
    "_id" : ObjectId("5a897f6c49bf66c10a70ed0d"), 
    "first_name" : "Jaskaran", 
    "last_name" : "singh", 
    "age" : 30.0
}
{ 
    "_id" : ObjectId("5a897f6c49bf66c10a70ed0f"), 
    "first_name" : "Amrit", 
    "last_name" : "singh", 
    "age" : 31.0
}
{ 
    "_id" : ObjectId("5a897f6c49bf66c10a70ed0e"), 
    "first_name" : "Vikas", 
    "last_name" : "Sharma", 
    "age" : 31.0, 
    "Address" : {
        "Pincode" : 1234.0
    }
}

我想删除密码

$pull 不工作！！

db.school.update(
{
    '_id':ObjectId("5a897f6c49bf66c10a70ed0e")
},
{ $pull: {
    Address: {
        Pincode:1    }    
} },
{ multi:true }
);

WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 0 })

db.school.update({}, {$pull:{ "Address": {$elemMatch: {Pincode :1234 } }}})

Answer 1

$pull 用于数组，而您尝试操作 sub-document.

方法是使用 $unset:

db.school.update({"Address.Pincode" : 1234}, { $unset: { "Address.Pincode" : "" } })

密码 1234。删除每个密码：

db.school.update({}, { $unset: { "Address.Pincode" : "" } })

不删除嵌入文档 mongo

not deleted embadded document mongo

pull

mongodb