Mongo和Node.js：使用UUID（GUID）通过_id查找文档 [英] Mongo and Node.js: Finding a document by _id using a UUID (GUID)

问题描述

我正在使用node.js开发restAPI，我正在尝试查询mongo集合。我可以使用字符串查询（例如companyname），但我需要能够查询文档中的_id元素。

I'm developing a restAPI using node.js and i'm trying to query a mongo collection. I can query using strings (for example "companyname") but I need to be able to query the "_id" element in the document.

在mongo中，_id目前存储如下（作为GUID）：

In mongo the _id is currently stored like this (as a GUID):

{
"_id" : new BinData(3, "MH+t3q6PD0SxVR5z7/pzfw=="), 
"companyname" : "TestCompany",
"databasename" : "TestDataBase",
}

这是我目前的GET方法：

This is what my current GET method looks like:

exports.getBusinessCardData = function(req, res) {
    var id = req.params.id;
    //"id" = MH+t3q6PD0SxVR5z7/pzfw==

    tradeShowAdminDB.collection('clients', function(err, collection) {
        collection.findOne({'_id': id}, function(err, item) {
            res.send(item);
        });
    });
};

进入方法的id是Base64字符串格式（MH + t3q6PD0SxVR5z7 / pzfw == ）并使用该查询返回任何内容（我假设它不是正确的类型/格式）。我的问题是如何将id转换为正确的格式，以便我可以使用_id查询mongo？

The "id" coming into the method is Base64 string format ("MH+t3q6PD0SxVR5z7/pzfw==") and using that the query returns nothing (i'm assuming as it's not the correct type/format). My question is how do I get that "id" into the correct format so that I can query mongo using the _id?

我一直在寻找年龄而且可以'似乎找到了解决方案，文档似乎非常模糊，不是24字符十六进制ObjectId。任何帮助将非常感谢！




其他信息：

I've been looking for ages and can't seem to find a solution and the documentation seems very vague on anything that isn't a 24 character hex ObjectId. Any help would be very much appreciated!

Additional information:

我正在使用节点v0.10.33并表达v4。 x

I'm using node v0.10.33 and express v4.x

我使用的mongo驱动程序只是节点的基本javascript mongo驱动程序。

（在此处找到： http：//docs.mongodb。 org / ecosystem / drivers / node-js / ）

The mongo driver I am using is just the base javascript mongo driver for node.
(found here: http://docs.mongodb.org/ecosystem/drivers/node-js/)

推荐答案

好的我找到了获得解决方案的解决方案将base64字符串转换为节点内的GUID格式，要转换它需要完成：

Ok i've found the solution to get the base64 string into a GUID format within node, to convert it this needs to be done:

var mongo.require('mongodb');
var GUID = new mongo.Binary(new Buffer(<base65String>, 'base64'), 3);

现在我可以像这样查询数据库：

and now i can query the database like this:

collection.findOne({'_id' : GUID}, function(err, item) {
                    res.send(item);
                });

这篇关于Mongo和Node.js：使用UUID（GUID）通过_id查找文档的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！