保存嵌套数组中的MongoDB

Question

我不明白为什么MongoDB中做到这一点，所以也许有人可以解释......下面是我的架构和代码，

- 使用mongoose-

var postSchema = new mongoose.Schema({ 
    raidName: String, 
    raidDate: String, 
    raidTime: String, 
    raidFaction: String, 
    whosGoing: { type: Array, "default": []} 
}); 


var realmSchema = new mongoose.Schema({ 
    realmName: String, 
    posts: [postSchema] 
}); 

下面是

我的数据库看起来如何

{ 
    "_id": { 
     "$oid": "581447f5fb4fab06dcbf10a6" 
    }, 
    "realmName": "Cho'gall", 
    "posts": [ 
     { 
      "raidName": "wailing cavs", 
      "raidDate": "Sat Oct 29 2016", 
      "raidFaction": "Horde", 
      "raidTime": "1:01 AM", 
      "_id": { 
       "$oid": "58144806fb4fab06dcbf10a7" 
      }, 
      "whosGoing": [ 
       { 
        "role": "DPS", 
        "gender": "Male", 
        "race": "Orc", 
        "classImg": "../images/class_photos/monk.png", 
        "class": "Monk", 
        "level": 90, 
        "name": "Monnky" 
       } 
      ] 
     } 
    ], 
    "__v": 1 
} 

我能够创造新的职位没有问题，但是 我不知道如何将更多的对象添加到“whosGoing”阵列.... 以下是林做..

var Realms = mongoose.model('realms'); 

    Realms.findOne({realmName: realm}, function (err, realm) { 
    realm.posts.id(postId).whosGoing.push(thisChar); //pushing it here no problem 
    console.log(realm.posts.id(postId).whosGoing); //when i log it here both objects are in the array just fine 
    console.log(realm); //but when i log the realm here, the item i just pushed is not in there, so of course if I realm.save() it wouldnt take effect... 
    realm.save(); 
    }) 

有人可以解释为什么发生这种情况，请..

Answer 1

有一个类似的问题here

但基本上你可以用& elementMatch找到数组中的欲望后，并使用位置$运营商所有标识的查询匹配的职位。例如：

var query = { 
    "realmName": realm, 
    "posts": { 
    $elemMatch: { 
     "_id": postId 
    } 
    } 
} 

var setField = { 
    $addToSet: { 
    "posts.$.whosGoing": thisChar 
    } 
} 

Realms.update(query, setField, function(err, results){ 
    if (err){console.log(err)} 
    else { 
    console.log(results); 
    } 
} 

Answer 2

使用$push操作：

Realms.update({ realmName: realm }, { $push: { whosGoing: thisChar } }, ...) 

也有$pull运营商从阵列移除值。