NodeJSでMongoDBからデータを取得

Question

MongoDBとNodeJS開発の新機能です。私は私が見つけたすべてを読んで、おそらく間違って検索しています。 私を助けてください！

私はこのデシベル持っている - 名前：ショップ、ドキュメント：カテゴリ、製品

これはdb.collectionです（ 'カテゴリ'）;

{ 
 
"_id" : { "$oid" : "5172d1daffdd81f3234d5f88" }, 
 
     "categories" : [ { 
 
     "categories" : [ { 
 
     "id" : "mens-clothing-suits", 
 
       "image" : "categories/mens-clothing-suits.jpg", 
 
       "name" : "Suits", 
 
       "page_description" : "Shop Men's suits for business or pleasure. Enjoy from a variety of different styles and cuts.", 
 
       "page_title" : "Mens Suits for Business and Casual", 
 
       "parent_category_id" : "mens-clothing", 
 
       "c_showInMenu" : true 
 
     }, 
 
     { 
 
     "id" : "mens-clothing-jackets", 
 
       "image" : "categories/mens-clothing-sportscoats.png", 
 
       "name" : "Jackets & Coats", 
 
       "page_description" : "Shop Men's Jackets, Coats & Outerwear. Classic outdoor-tested garments with traditional styling details that provide comfort, insulation and ease of movement, whatever the weather.", 
 
       "page_title" : "Men's Jackets Including Jackets & Blazzers", 
 
       "parent_category_id" : "mens-clothing", 
 
       "c_showInMenu" : true 
 
     }, 
 
     { 
 
     "id" : "mens-clothing-dress-shirts", 
 
       "image" : "categories/mens-clothing-dress-shirts.jpg", 
 
       "name" : "Dress Shirts", 
 
       "page_description" : "Shop Men's dress shirts in a variety of colors and styles including striped, button down, non-iron & more", "page_title" : "Men's Dress Shirts including Striped, Button Down, Non-Iron & More", 
 
       "parent_category_id" : "mens-clothing", 
 
       "c_showInMenu" : true 
 
     }, 
 
     { 
 
     "id" : "mens-clothing-shorts", 
 
       "image" : "categories/mens-clothing-shorts.png", 
 
       "name" : "Shorts", "page_description" : "Shop Men's spring shorts in cotton. Variety of different fits.", 
 
       "page_title" : "Men's Spring Shorts", 
 
       "parent_category_id" : "mens-clothing", 
 
       "c_showInMenu" : true 
 
     }, 
 
     { 
 
     "id" : "mens-clothing-pants", 
 
       "image" : "categories/mens-clothing-pants.png", 
 
       "name" : "Pants", 
 
       "page_description" : "Shop Men's Trousers. Practical, easy-to-wear styles wherever you're headed. Check out famous rugged, long-lasting trousers, jeans, cargo pants and more.", 
 
       "page_title" : "Men's Pants Including Khakis, Cargos, Trousers, Jeans & More", 
 
       "parent_category_id" : "mens-clothing", 
 
       "c_showInMenu" : true 
 
     } ], 
 
       "id" : "mens-clothing", 
 
       "image" : "categories/mens-clothing-accessories.jpg", 
 
       "name" : "Clothing", 
 
       "page_description" : "Shop Men's Clothing. Relaxed, timeless classics you can rely on; from denim to corduroys and sweaters to shirts. Huge range of contemporary colours and eco-aware designs: great casualwear.", 
 
       "page_title" : "Mens Clothing Including Suits, Tops, Bottoms & More", 
 
       "parent_category_id" : "mens", 
 
       "c_showInMenu" : true 
 
     }, 
 
     { 
 
     "categories" : [ { 
 
     "id" : "mens-accessories-ties", 
 
       "image" : "categories/mens-accessories-ties.png", 
 
       "name" : "Ties", "page_description" : "Shop Mens's Ties for all occasions including business or casual.", 
 
       "page_title" : "Men's Casual and Business Ties", 
 
       "parent_category_id" : "mens-accessories", 
 
       "c_showInMenu" : true 
 
     }, 
 
     { 
 
     "id" : "mens-accessories-gloves", 
 
       "name" : "Gloves", 
 
       "page_description" : "Shop Men'sGloves. Versatile, commuter, boot, oxford, deer and resolve gloves. All with famous long-lasting quality.", 
 
       "page_title" : "Men's Gloves", 
 
       "parent_category_id" : "mens-accessories", 
 
       "c_showInMenu" : true 
 
     }, 
 
     { 
 
     "id" : "mens-accessories-luggage", 
 
       "image" : "categories/mens-accessories-luggage.jpg", 
 
       "name" : "Luggage", 
 
       "page_description" : "Shop Men's Wheeled Luggage. Versatile, rugged suitcases, baggage, holdalls and shoulder bags. All with famous long-lasting quality.", 
 
       "page_title" : "Men's Wheeled Luggage", 
 
       "parent_category_id" : "mens-accessories", 
 
       "c_showInMenu" : true 
 
     } ], 
 
       "id" : "mens-accessories", 
 
       "name" : "Accessories", 
 
       "page_description" : "Shop mens accessories including belts, wallets. gloves, hats, watches, luggage & more.", 
 
       "page_title" : "Men's Accessories Belts, Wallets. Gloves, Hats, Watches, Luggage & More", 
 
       "parent_category_id" : "mens", 
 
       "c_showInMenu" : true 
 
     } ], 
 
     "id" : "mens", 
 
     "name" : "Mens", 
 
     "page_description" : "Men's range. Hard-wearing boots, jackets and clothing for unbeatable comfort day in, day out. Practical, easy-to-wear styles wherever you're headed.", 
 
     "page_title" : "Men's Footwear, Outerwear, Clothing & Accessories", 
 
     "parent_category_id" : "root", 
 
     "c_showInMenu" : true 
 
}

と私が持っているNodeJS用 - >

exports.index = function(req, res) { 
 
\t var _   = require("underscore"); 
 
\t // var parseSchema = require('mongodb-schema'); 
 
\t var mdbClient = require('mongodb').MongoClient; 
 

 
mdbClient.connect("mongodb://localhost:27017/shop", function(err, db) { 
 
\t \t var collection = db.collection('categories'); 
 

 
\t \t collection.find().toArray(function(err, items) { 
 
\t \t \t res.render("index", { 
 
\t \t \t // \t // Underscore.js lib 
 
\t \t \t \t _  : _, 
 
\t \t \t \t 
 
\t \t \t // \t // Template data 
 
       title : "Hello World!", 
 
\t \t \t \t items : items 
 
\t \t \t }); 
 

 

 
\t \t \t db.close(); 
 
\t \t }); 
 
}); 
 
\t console.dir("Called findOne!"); 
 
};

私は変数に設定する必要があります。

VARカテゴリ= //アル例えばリットルカテゴリ：メンズ、レディース

VARのサブカテゴリ= //例えばすべてのサブカテゴリを：衣料など

各変数に到達する権利の方法は何ですか？

ありがとうございました！フィールドの

Answer 1

デモ：

db.getCollection('categories').find(
     {"categories.0.categories.image":"categories/mens-clothing-suits.jpg"}, 
     {"categories.categories.image":1}); 

同様に、あなたが他のフィールド