node.js - 从 Mongoose 的子文档 ID 中查找父文档

Question

我有一个 subdoc Id，我需要使用 Mongoose 和 MongoDB 返回 parent Doc。我在这里阅读:MongoDB: How to find by subdocument ID?我应该只能使用 Polls.find({'options': id} 但它返回任何空数组而不是适当的文档。

架构

var Polls = new Schema({
    name: String,
    options: [{
        name: String,
        count: Number
    }]
}

样本投票

{
"_id": {
    "$oid": "58ac963a8a84500de89c1080"
},
"name": "Here is one Poll",
"options": [
    {
        "name": "This is the first one",
        "count": 0,
        "_id": {
            "$oid": "58ac963a8a84500de89c1083"
        }
    },
    {
        "name": "Second One",
        "count": 0,
        "_id": {
            "$oid": "58ac963a8a84500de89c1082"
        }
    }
],
"__v": 0
}

Answer 1

我认为你查询错了。

试试这个:

Polls.find({'options._id': id},function(err,result){
    //result will be an array of matched document
    //result[i]._id will give you the parent id.
    //if there is only one such document, you can try : result[0]._id
});