假设我有一个集合allitems，其中每个文档的形式都是{_id:"1",items:[{number:1,main:"howareyou?",sub:[{id:1,item:"doesitchangewiththeday?",score:0},{id:2,item:"someotherquestion",score:0}]}]}如何更新子项目的分数？我试过了db.allitems.update({_id:"1"},{$set:{'items.0.sub.0.score':5}});我收到这个错误:error:{"$err":"Unsupportedprojectionoption:i

我在mogodb中有一个这样的集合:{"_id":ObjectId("5393006538efaae30ec2d458"),"userName":"shiva","userUnderApiKey":123456,"groups":[{"groupName":"Default","groupMembers":[]}]}我想在组数组中添加一个新组作为子文档，如下所示{"_id":ObjectId("5393006538efaae30ec2d458"),"userName":"shiva","userUnderApiKey":123456,"groups":[{"groupName":"De

这是我的收藏:{"_id":10926400,"votes":131,"author":"Jesse","comments":[{"id":1,"votes":31,"author":"Mirek"},{"id":2,"votes":13,"author":"Leszke"}]},{"_id":10926401,"votes":75,"author":"Mirek","comments":[{"id":1,"votes":17,"author":"Jesse"},{"id":2,"votes":29,"author":"Mirek"}]}我想要每个author的$sumvotes和co

我目前有一个Message模式，它有一个回复的子文档:message:String,replies:[{message:String,userFrom:{type:mongoose.Schema.Types.ObjectId,ref:'User'}}]我正在尝试发出一个POST请求，该请求将允许我findOneAndUpdate消息以附加回复。我尝试了以下操作:Message.findOneAndUpdate(req.params.id,{replies:{message:req.body.reply,userFrom:req.user._id}},function(err,data)

更新:目前我有这个架构:varSchema=newschema({name:String,type:{type:String},date:{type:Date},descrip:String,});但是我使用这个模式来生成2个文档:THEATYPE({name:'A',type:'TYPE_B',date:{type:Date},descrip:'DESC_A',});THEBTYPE({name:'B',type:'TYPE_B',date:{type:Date},descrip:'DESC_B',});名称、类型和描述在A和B类型中始终相同，唯一改变的是日期字段，所以我在想，我该如

我正在使用MongoDBshell来获取一些有序的结果。这是一个采样器，{"_id":"32022","topics":[{"weight":281.58551703724993,"words":"somewords"},{"weight":286.6695125796183,"words":"somemorewords"},{"weight":289.8354232846977,"words":"wowzevenmorewordz"},{"weight":305.70093587160807,"words":"WORDZ"}]}我想得到的是，相同的结构，但按"topics"排序:[]

我有一个查找帐户并填充该帐户的子文档的查询。当我使用populatepath:"orders"时，限制选项将起作用。但是如果我使用填充路径“orders.order”，选项限制将不起作用。我该怎么办？我的模式是这样的:varAccountSchema=newmongoose.Schema({_id:id,orders:{type:[{order:{type:mongoose.Schema.Types.ObjectId,ref:'Order'}}]}});varfindOrderByUserId=function(accountId,index,count,callback){varli

在mysql中，我有这样的查询:mysql>SELECTuser_id,count(user_id)asdupFROMaddressbookGROUPBYuser_idHAVINGdup>20ORDERBYdup;会返回:+---------+------+|user_id|dup|+---------+------+|3052|21||996|23||46|25||2709|26||1756|28||43|30||224|30||98|32||289|35||208|40||888|43||4974|44||31|46||166|65||4560|99||85|112||280|12

我在MongoDB中有一个文档集合，其结构如下(有多个容器文档，每个容器文档包含Sessions，每个session包含1个订单，每个订单包含多个项目):{"Sessions":[{"ID":"1882a092-d395-45d1-b36b-e2fa3df81b95","Order":{"Items":[{"_id":"a9c94a5e-10ef-433d-9c63-f4555eb7c2a7","Title":"UPDATETHIS",}]}}],"_id":"1b640bc4-fdb4-49b1-9c60-e4c6f1bd0405"}我想更新session中订单中给定Item的Tit

这个问题在这里已经有了答案:RetrieveonlythequeriedelementinanobjectarrayinMongoDBcollection(16个答案)关闭4年前。我的模式是这样的[{"_id":ObjectId("565f0f5d77f0c7bd11bbadd8"),"blog_id":ObjectId("56587befdb7224110f007233"),"comments":[{"user_id":ObjectId("562fa014888806820e21e0df"),"user_full_name":"NirojPaudel","comment":"prad