在Node.js的

Question

从猫鼬填充对象，而数据库的一部分，你通常在Javascript中创建一个新的对象是这样的：

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

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

一旦做到这一点，你像这样创建的对象的新“实例”

var myObject = new object; 

而myObject将具有正确的属性和功能。

如果我需要使用Mongoose（异步）从MongoDB加载属性值，有没有办法做到这一点？

与此相似？

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函数，但似乎他们没有做我所需要的。 （或我只是没有得到它）​​

我认为这很简单，我忽略了明显的，所以请指向正确的方向。非常感谢！

Answer 1

我不知道MongoDB的，但你可以很容易地做你想做的通过传递你从服务器返回到构造数据库对象：

你也可以传递对象，像这样：

var myObject = new object(MongoDBObj); 

然后在你的目标代码，你可以做这样的事情：

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] 

} 

编辑：我的第一个评论

你也可以做到这一点（简单的例子）;

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 - 下面的讨论显示结果：

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] 

}