MongoDB 中使用 Mongoose 的动态字段名称

Question

. collection 航班示例 :

 {
        "Orig" : "AGP",
        "Dest" : "CMN",
        "Description_Flight" : "One-Stop-Narrow Type",
        "Description_Flight_2" : "WESTERN EUROPE/WESTERN EUROPE",
        "Mkt_Al" : "0B"

  }

. collection 的样本 Coeff :

{
    "Regions" : "WESTERN EUROPE/WESTERN EUROPE",
    "Non-Stop-Narrow Type" : 2.4109,
    "Non-Stop-Supersonic" : 2.71828,
    "One-Stop-Narrow Type" : 2.22554,
    "One-Stop-Turbo" : 0.92312,
    "One-Stop-Wide Type" : 11.24586,
    "One-Stop Online-Turbo" : 0.07577

}

我想要什么？

我有我的起始 collection、Flights 并且我想为每个文档打分，一个基于 Description_Flight_2 和 Description_Flight 的分数。

示例：

例如，在我的示例中我有：

        "Description_Flight" : "One-Stop-Narrow Type",
        "Description_Flight_2" : "WESTERN EUROPE/WESTERN EUROPE",

所以，我应该去 Coeff collection，然后找到区域 :

          "WESTERN EUROPE/WESTERN EUROPE"

然后取适当的值，这里我应该在这一行取这个值：

        "One-Stop-Narrow Type" : 2.22554,

我试过了:

    mongoose.connect('mongodb://localhost/mydb');

var cSchema = new Schema({},{ strict: false, collection: 'flights' }),    
    dflights = mongoose.model("flights", cSchema);
var rSchema = new Schema({},{ strict: false, collection: 'coeff' }), 
    coeff = mongoose.model("coeff", rSchema);
    mongoose.set('debug', false);

    mongoose.connection.on("open", function (err) { 
    if (err) throw err;  


    dflights.find({}).lean().exec(function (err, flights) {  
    if (err) throw err; 

    flights.forEach(function(flight) { 

var Flight_Description = "", score =0 ;

    coeff.findOne({Regions : flight.Description_Flight_2}).lean().exec(function (err, coef) {

这里是重要的几行：

    Flight_Description = flight.Description_Flight;
    score = (coef != null ) ?  coef.Flight_Description : "Missed data";

这是最后几行

if ( score != 0) 
    dflights.collection.update({_id:flight._id}, { $set : { score :score } } );        
});
});
});
});

请问我怎样才能达到上述目标？

Answer 1

正确的代码应该是：

score = (coef != null ) ?  coef[Flight_Description] : "Missed data";

MongoDB 中使用 Mongoose 的动态字段名称

Dynamic field names in MongoDB using Mongoose

javascript

node.js

mongodb

mongoose

field-names