忽略了幾個領域

假設你不希望最終填充文件的 address 欄位中的欄位 houseNum 和 street，請使用 populate()，如下所示，

Person.findOne({_id: req.params.id})
    .populate('address', '-houseNum -street')  // note the `-` symbol
    .exec(function(err, person) {
        // do something.
        // variable `person` contains the final populated data
    });

要麼

Person.findOne({_id: req.params.id}, function(err, person) {
    // do something
    // variable `person` contains the final populated data
})
.populate('address', '-houseNum -street');  // note the `-` symbol

這將生成以下最終填充的文件，

填充檔案

 {
    "_id":"123abc",
    "fname":"John",
    "mname":"Kennedy",
    "lname":"Doe",
    "address":{
        "_id":"456def",
        "city":"City of the dead",
        "state":"AB",
        "country:"PH"
    }
}