在Node.js的

Question

從貓鼬填充對象，而數據庫的一部分，你通常在Javascript中創建一個新的對象是這樣的：

function object() { 
    this.attribOne: 42, 
    this.attribTwo: 'fourtytwo', 

    [and so on creating more attribs and functions.] 
}; 

一旦做到這一點，你像這樣創建的對象的新「實例」

var myObject = new object; 

而myObject將具有正確的屬性和功能。

如果我需要使用Mongoose（異步）從MongoDB加載屬性值，有沒有辦法做到這一點？

與此相似？

function object() { 
    /* list of attributes */ 
    this.attribOne: null, 
    this.attribTwo: null, 

    function init(){ 
     // mongoose db call 
     // set attributes based on the values from db 
    } 
}; 

我看着init函數，但似乎他們沒有做我所需要的。 （或我只是沒有得到它）​​

我認爲這很簡單，我忽略了明顯的，所以請指向正確的方向。非常感謝！

Answer 1

我不知道MongoDB的，但你可以很容易地做你想做的通過傳遞你從服務器返回到構造數據庫對象：

你也可以傳遞對象，像這樣：

var myObject = new object(MongoDBObj); 

然後在你的目標代碼，你可以做這樣的事情：

function object(data) { 

this.myProp1 = data.Prop1;//from db obj 
this.myProp2 = data.Prop2;//from db obj 

this.myProp3 = getProp3Calculation(); //from global calculation 

[more functions and props for the object] 

} 

編輯：我的第一個評論

你也可以做到這一點（簡單的例子）;

function object() { 

this.myProp1 = null; 
this.myProp2 = null; 

this.myProp3 = getProp3Calculation(); //from global calculation 

this.init = function([params]){ 
    var that = this;  


    var data = loadData(params); 

    //if asynchronous the following code will go into your loadCompletedHandler 
    //but be sure to reference "that" instead of "this" as "this" will have changed 
    that.myProp1 = data.Prop1; 
    that.myProp2 = data.Prop2; 

}; 

[more functions and props for the object] 

} 

更新3 - 下面的討論顯示結果：

function object() { 

this.myProp1 = null; 
this.myProp2 = null; 

this.myProp3 = getProp3Calculation(); //from global calculation 

this.init = function([params], callback){ 
    var that = this;  



    var model = [Mongoose Schema]; 
    model.findOne({name: value}, function (error, document) { 
     if (!error && document){ 

      //if asynchronous the following code will go into your loadCompletedHandler 
      //but be sure to reference "that" instead of "this" as "this" will have changed 
      that.myProp1 = document.Prop1; 
      that.myProp2 = document.Prop2; 

      callback(document, 'Success'); 


     } 
     else{ 
      callback(null, 'Error retrieving document from DB'); 
    } 
    }); 



}; 

[more functions and props for the object] 

}