Question

对于以下MongoDB结果，我试图编写一个查询，其中名称字段不是Demo或Demo 2，而Items.location是equal to hongkong：

{
    "_id": ObjectID("573ac4d1ad364cd534a03e15"),
    "updatedAt": ISODate("2016-05-17T07:14:25.341Z"),
    "createdAt": ISODate("2016-05-17T07:14:25.341Z"),
    "name": "Testing",
    "Items": {
        "date": "18052016",
        "location": "hongkong"
    },
    "__v": 0
},
{
    "_id": ObjectID("573ac4d1ad364cd534a03e16"),
    "updatedAt": ISODate("2016-05-17T07:14:25.341Z"),
    "createdAt": ISODate("2016-05-17T07:14:25.341Z"),
    "name": "Demo",
    "Items": {
        "date": "18052016",
        "location": "hongkong demo"
    },
    "__v": 0
},
{
    "_id": ObjectID("573ac4d1ad364cd534a03e16"),
    "updatedAt": ISODate("2016-05-17T07:14:25.341Z"),
    "createdAt": ISODate("2016-05-17T07:14:25.341Z"),
    "name": "Demo 2",
    "Items": {
        "date": "18052016",
        "location": "hongkong demo"
    },
    "__v": 0
}

我的查询如下：

mySchema.statics.testing = function *() {
    var output =  this.find(
        {
            name: {
                $nin: ["Demo", "Demo 2"]
            }
        }
        ,{
            Items: {
                $elemMatch: { location: "hongkong" }
            }
        }).exec();

    return output;
};

我的架构如下：

var mongoose = require('mongoose');
var mySchema = new mongoose.Schema({
    name: String,
    Items: Object
}, { timestamps: true });

查询似乎只返回匹配的"_id"字段，因为我希望返回所有字段，name，Items..etc。我错过了什么？

Answer 1

试试这段代码

mySchema.statics.testing = function (fn) {
        this.find(
            {
                name: {
                    $nin: ["Demo", "Demo 2"]
                },
                "Items.location": "hongkong"
            })
            .exec(function (err, docs) {
                fn(err, docs)
            })
    };

Answer 2

固定。需要：

var output =  this.find(
        {
            name: {
                $nin: ["Demo", "Demo 2"]
            },
            "Items.location" : "hongkong"
        }).exec();

    return output;
};

返回MonoDB中与Object类型中嵌入的字段值匹配的所有字段

2 个答案: