javascript - mongoDB: adding and updating some fields in a (nested) object -

this mongodb document, need add data:

{     "_id" : "7kufvmqfyyeukfp68",     "target" : {         "10" : "true",         "id" : "epce6fbahx9kekjum"     } } 

i need update existing fields in target or add them, if not exist. tried:

var result = { "30": "true", "id" : "epce6fbahx9kekjum" };  collection.upsert(     { _id: id },      { $set: { target: result } } ); 

but 10 replaced 30, expect result:

{     "_id" : "7kufvmqfyyeukfp68",     "target" : [{         "10" : "true",         "30" : "true",         "id" : "epce6fbahx9kekjum"     }] } 

it seems want array of objects updated. array target field make sure type array in schema. update array select array id or field of choice.

this code finds field , adds "30" : "true", , leaves other information in object inside array. hope helps.

var userschema = new mongoose.schema({     name: string,     target : [] }) var user = mongoose.model("user", userschema); //creat documenent   var user1 = new user({     name : "jack",     target :[{         "10" : "true",         "id" : "epce6fbahx9kekjum"     }] }) user1.save(user1, function(err, user){     console.log(user) }) user.findoneandupdate(     {"name" : "jack"},     {safe : true, upsert : true, new :true},     function(err, model){         model.target[0]["30"] = "true"         console.log(model.target)     } )