如何获取嵌套的JSON对象MongoDB的数据与node.js

我在我的MONGODB中有一个JSON对象

{ "_id" : ObjectId("59d4b9848621854d8fb2b1e1"), "Bot_name" : "Scheduling bot", "Modules" : [ { "ModuleID" : "1111", "ModuleStatement" : "This is a Sceduling bot, Would you like to book a flight?", "_id" : ObjectId("59d4b9968621854d8fb2b1e3"), "ModuleResponse" : [ { "Response" : "yes", "TransBotID" : "1112" }, { "Response" : "no", "TransBotID" : "1113" } ] }, { "ModuleID" : "1112", "ModuleStatement" : "Where would you like to go? New York ? LA?", "_id" : ObjectId("59d4b9968621854d8fb2b1e3"), "ModuleResponse" : [ { "Response" : "New York", "TransBotID" : "1121" }, { "Response" : "LA", "TransBotID" : "1122" } ] }, { "ModuleID" : "1121", "ModuleStatement" : " New York..", "_id" : ObjectId("59d4b9968621854d8fb2b1e3"), "ModuleResponse" : [] }, { "ModuleID" : "1121", "ModuleStatement" : " New York..", "_id" : ObjectId("59d4b9968621854d8fb2b1e3"), "ModuleResponse" : [] } } 

我做了一个查询，将首先检查Bot_name，然后检查包含JSON对象是1111,1112,1121的嵌套数组模块中的ModuleID。那么我如何只获取ModuleID:1111的JSON对象ModuleID:1111的Bot_name:Scheduling bot

到目前为止我的查询是

 botSchema.findOne({ Bot_name: req.body.Name ,'Modules.ModuleID':req.body.MID}, function (err, data) { console.log(data) } 

这里的查询返回Modules内的所有json

如何只得到一个所需的json对象？ 喜欢这个

 { "ModuleID" : "1111", "ModuleStatement" : "This is a Sceduling bot, Would you like to book a flight?", "_id" : ObjectId("59d4b9968621854d8fb2b1e3"), "ModuleResponse" : [ { "Response" : "yes", "TransBotID" : "1112" }, { "Response" : "no", "TransBotID" : "1113" } ] } 

Answer 1

您需要使用$elemMatch过滤子数组。

 db.botSchema.findOne( { Bot_name: "Scheduling bot"} , { 'Modules': { $elemMatch:{'ModuleID':"1111"} } } , function (err, data) { console.log(data) }) 

结果：

 { "_id" : ObjectId("59d4b9848621854d8fb2b1e1"), "Modules" : [ { "ModuleID" : "1111", "ModuleStatement" : "This is a Sceduling bot, Would you like to book a flight?", "_id" : ObjectId("59d4b9968621854d8fb2b1e3"), "ModuleResponse" : [ { "Response" : "yes", "TransBotID" : "1112" }, { "Response" : "no", "TransBotID" : "1113" } ] } ] }