node.js – Mongoose：“_doc”是什么？

1 var Foo = new mongoose.model('Foo',new mongoose.scheR_836_11845@a({a: String,b: number}));
2 var foo = new Foo({a: 'test; b: 42}); 
3 var obj = {C: 1};
4 foo.goo = obj;                  // simple object assignment. obj should be 
                                  //   passed by reference to foo.goo. recall goo
                                  //   is not defined in the Foo model scheR_836_11845@a

5 console.log(foo.goo === obj);   // comparison directly after the assignment
    // => false,doesn't behave like normal JS object

基本上,任何时候你试图处理@L_448_0@mongoose模型的属性,它不是a)在模型的模式中定义的,或者b)被定义为相同的类型(array,obj,..)……模型甚至都没有表现得像一个普通的Javascript对象.

将第4行切换为foo._doc.goo = obj使控制台输出为true.

编辑：试图重现怪异

例1：

// Customer has a property 'name',but no property 'text'
 // I do this because I need to transform my data slightly before sending it
 // to client.
 models.Customer.find({},function(err,data) {
     for (var i=0,len=data.length; i<len; ++i) {
        data[i] = data[i]._doc;            // if I don't do this,returned data
                                           // has no 'text' property
        data[i].text = data[i].name;       
    }
    res.json({success: err,response:data});
});