mongoose 查询子文档的方法

 {
   "__v": 1,
   "_id": "538f5f0f6195a184108c8bd8",
   "title": "GameTitle",
   "item": [{
     "_id": "538f5f0f6195a184108c8bd6",
     "name": "itemOne",
     "men": [{
       "_id": "5390cccf0a84f41f37082874",
       "user": "id22222222",
       "score": 2000
     }, {
       "_id": "2390cccf0a84f41f37082873",
       "user": "id33333333",
       "score": 1000
     }]
   }, {
     "_id": "538f5f0f6195a184108c8bd7",
     "name": "itemTwo",
     "men": []
   }],
   "status": 1
 }

 //代码是:
     var MenSchema = new mongoose.Schema({
     user: 'String',
     score: {
         type: Number,
         default: 0
         }
     });

     var ItemsSchema = new mongoose.Schema({
         name: String
         ,men: [MenSchema]
     });

     ListsSchema = new mongoose.Schema({
         title: {
             type: String,
             required: true
         }
         ,item: [ItemsSchema]
     });

     var Items = mongoose.model('item', ItemsSchema);
     var Lists = mongoose.model('lists', ListsSchema);
     var Men = mongoose.model('men', MenSchema);
 Insert and update:

 function commit(sId, sItem, sUser, sIncreaseScore) {
     Lists.findOne({, "_id": sId,
             "item.name": sItem
         }, null, function(err, documents) {
             if (!err) {
                 if (documents != null) {
                     Lists.findOne({
                         "_id": sId,
                         "item.name": sItem,
                         "item.men.user": sUser
                     }, null, function(err, subDoc) {
                         if (!err) {
                             if (subDoc != null) {
                                 //increase user score
                                 //!!!!!!!!!!!!!But subDoc will get all arrays of item.men, so I can't update it correctly
                             } else {
                                 //inser new user score
                                 var userData = new Men({
                                     user: sUser,
                                     score: sScore
                                 });

                                 documents.item[0].men.push(userData);
                                 documents.save(function(err) {
                                     if (!err) {
                                         ///!!!!!!!!!!!!!!Will come this
                                         console.log("documents error on save!");
                                     } else {
                                         console.log("save documents ok!");
                                     }
                                 });
                             }
                         }
                     });
                 }
             } else {
                 console.log("not find the game item!");
             }
         }
     );
 }

这种查询方法比较特殊，直接用子文档的属性作为查询条件

 "item.men.user": sUser

也可以这样查找：

Lists.items.men.id("id");

此时查到的就是子文档中的某一条，而不是整个父文档，

执行删除

Lists.items.men.id("id");

在保存文档