Mongoose：我需要子文檔來生成「_id」而不是「id」來搜索文檔數組

Question

我跟着Simon Holmes的書「Getting MeAN」一書，但是，我偶然發現了有關子文檔的問題IDS。我試圖使用「貓鼬」提供的幫助函數「MongooseDocumentArray.id(id)」在「位置文檔」中請求「審閱文檔」。但是，我的所有子文檔生成「id」，但前面提到的函數需要「_id」，因此返回「空「對象

功能描述：？搜索與匹配_id的第一個文檔數組項

問題是什麼在這裏，我父文檔是‘位置_id’與產生它的ID」 「，這讓我更加困惑......嵌套的模式設置，從包含審閱子文檔和控制器功能的數據庫返回的位置對象fo查詢的路由分別在下面的代碼片段中說明。

var mongoose = require("mongoose"); 

var reviewSchema = new mongoose.Schema({  
    author: String, 
    rating: {type: Number, required: true, min: 0, max: 5}, 
    reviewText: String, 
    createdOn: {type: Date, "default": Date.now} 
}); 

var locationSchema = new mongoose.Schema({ 
    name: {type: String, required: true}, 
    address: String, 
    rating: {type: Number, "default": 0, min: 0, max: 5}, 
    facilities: [String], 
    coords: {type: [Number], index: "2dsphere"}, 
    reviews: [reviewSchema] 
}); 

mongoose.model('Location', locationSchema); 

Returned Location object showing subdocuments containing id instead of _id

對於下面的片段，這是相關的路線：

router.get("/locations/:locationid/reviews/:reviewid", ctrlReviews.reviewsReadOne); 



module.exports.reviewsReadOne = function(req, res){ 
if(req.params && req.params.locationid && req.params.reviewid){ 
    Loc.findById(req.params.locationid) 
     .select("name reviews") 
     .exec(function(err, location) { 
      var response, review; 
      if(location.reviews && location.reviews.length > 0){      
       // This returns zero, because the function requires _id 
       // but all subdocuments have path/properties called id 
       review = location.reviews.id(req.params.reviewid); 
       console.log(review); 

       if(!review){ 
        sendJsonResponse(res, 404, { 
         "message": "reviewid not found" 
        }); 
       } else { 
        response = { 
         location: { 
          name: location.name, 
          id : req.params.locationid 
         }, 
         review: review 
        }; 
        sendJsonResponse(res, 200, response); 
       } 
      } 
    }) 
} 

};

Answer 1

將模式更改爲以下內容。

var locationSchema = new mongoose.Schema({ 
    name: {type: String, required: true}, 
    address: String, 
    rating: {type: Number, "default": 0, min: 0, max: 5}, 
    facilities: [String], 
    coords: {type: [Number], index: "2dsphere"}, 
    reviews: [{ 
     author: String, 
     rating: {type: Number, required: true, min: 0, max: 5}, 
     reviewText: String, 
     createdOn: {type: Date, "default": Date.now 
    }]  
});