mongoose-virtualプロパティ

mongooseはバーチャルプロパティ(virtual property)をサポートしています、このトピックで紹介します。

var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/test01');

var PersonSchema = new mongoose.Schema({
  name:{
      first:String,
      last:String
  }
});
PersonSchema.virtual('name.full').get(function(){
    return this.name.first + ' ' + this.name.last;
});
PersonSchema.virtual('name.full').set(function(name){
    var split = name.split(' ');
    this.name.first = split[0];
    this.name.last = split[1];
});

var db = mongoose.connection;
db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', function callback () {

    var PersonModel = mongoose.model('Person',PersonSchema);

    var person1 = new PersonModel({
      name:{first:'koma',last:'endia'}
    });
    console.log("person1=" + person1.name.first + " " + person1.name.last);
    console.log("person1=" + person1.name.full);

    var person2 = new PersonModel({});
    person2.name.full = "koma endia";
    console.log("person2=" + person2.name.first + " " + person2.name.last);
    console.log("person2=" + person2.name.full);
});

mongooseでMongoDBに接続してみる

前回と前々回はmongodbとmongoskinを使ってMongoDBに接続処理を紹介しました、今回はmongooseの使い方を紹介します。

Mongoose
http://mongoosejs.com/

まず、インストールします

npm install mongoose

MongoDBは何もせずに、直接にアクセスコードを書きます

nano mongoose.js
...
var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/test01');

var kittySchema = mongoose.Schema({
    name: String,
    age: Number
    });
kittySchema.methods.speak = function () {
  var greeting = this.name
      ? "Meow name is " + this.name : "I don't have a name"
  console.log(greeting);
}
kittySchema.statics.findAge10 = function(cb) {
  this.find({age:10}, cb);
}

var db = mongoose.connection;
db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', function callback () {
    var Kitten = mongoose.model('Kitten', kittySchema);
    var silence = new Kitten({ name: 'Silence', age: 10 });
    console.log(silence.name);
    silence.speak();

    silence.save(function(error, doc){
        if (error) throw error;

        doc.speak();
    });

    Kitten.find({age:10}, function(error, kittens){
        if (error) throw error;
        //console.log(kittens.length);
        for(var i = 0; i < kittens.length; i++) {
            console.log("name=" + kittens[i].name + ", age=" + kittens[i].age);
        }
    });
    Kitten.findAge10(function(error, kittens){
        if (error) throw error;
        for(var i = 0; i < kittens.length; i++) {
            console.log("[findAge10]" + "_id=" + kittens[i]._id + ", name=" + kittens[i].name + ", age=" + kittens[i].age);
        }
    });
});
...