node.js 传入的参数必须是 24 个十六进制字符的字符串 - 我认为是
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Argument passed in must be a string of 24 hex characters - I think it is
提问by Carasel
I have a method to find a document in my database based on its ObjectID:
我有一种方法可以根据其 ObjectID 在我的数据库中查找文档：
console.log('id: ' + id + ' type: ' + typeof id);
collection.findOne({'_id':new ObjectID(id)}, function(error,doc) {
if (error) {
callback(error);
} else {
callback(null, doc);
}
});
When I run it I get the following error:
当我运行它时，我收到以下错误：
/myPath/node_modules/monk/node_modules/mongoskin/node_modules/mongodb/lib/mongodb/connection/base.js:245
throw message;
^
Error: Argument passed in must be a single String of 12 bytes or a string of 24 hex characters
at new ObjectID (/myPath/node_modules/mongodb/node_modules/bson/lib/bson/objectid.js:38:11)
at /myPath/collectionDriver.js:134:41
This refers to the collection.findOne()line above.
这是指collection.findOne()上面的行。
The console log I have before that call outputs the id as a string of 24 hex characters:
我在调用之前的控制台日志将 id 输出为 24 个十六进制字符的字符串：
id: "55153a8014829a865bbf700d" type: string
Before this I convert the id from an object to a string using JSON.stringify()but it appears to work successfully as shown in my console.log.
在此之前，我将 id 从一个对象转换为一个字符串，JSON.stringify()但它似乎成功地工作，如我的 console.log 所示。
Running db.myCollection.findOne({_id : ObjectId("55153a8014829a865bbf700d")})in Robomongo brings back the expected result.
db.myCollection.findOne({_id : ObjectId("55153a8014829a865bbf700d")})在 Robomongo 中运行带来了预期的结果。
回答by Carasel
The id that was passed in to my function was already an object ID in this case, so did not need a new ObjectID to be created from it.
在这种情况下，传递给我的函数的 id 已经是一个对象 ID，因此不需要从中创建新的 ObjectID。
When ObjectIDs are logged out to the console they appear as hex strings, rather than ObjectID("hexString"), so I thought I needed to convert it to do the find, but it was already in the format that I needed.
当 ObjectID 被登出到控制台时，它们显示为十六进制字符串，而不是ObjectID("hexString")，所以我认为我需要将它转换为查找，但它已经是我需要的格式。
回答by Martín Mtz
Try this:
尝试这个：
var hex = /[0-9A-Fa-f]{6}/g;
id = (hex.test(id))? ObjectId(id) : id;
collection.findOne({'_id':new ObjectID(id)}, function(error,doc) {
if (error) {
callback(error);
} else {
callback(null, doc);
}
});
回答by profesoralex
In my case, this worked:
就我而言，这有效：
var myId = JSON.parse(req.body.id);
collection.findOne({'_id': ObjectID(myId)}, function(error,doc) {
if (error) {
callback(error);
} else {
callback(null, doc);
}
});
Don't forget to include at the beginning:
不要忘记在开头包含：
var ObjectId = require('mongodb').ObjectID;
回答by Talgat Medetbekov
Try out ObjectID(id)instead of new ObjectID(id)
尝试ObjectID(id)而不是new ObjectID(id)
回答by struensee
Yeah, I just spent thirty minutes baffled by this. If anyone finds themselves here, first check if you even need to convert to ObjectID in the first place. Like OP, I forgot that the hexstring is logged as just that - a hexstring.
是的，我只是花了三十分钟对此感到困惑。如果有人发现自己在这里，请首先检查您是否甚至需要首先转换为 ObjectID。像 OP 一样，我忘记了 hexstring 是这样记录的 - 一个 hexstring。
