在nodejs中转换为对象id时抛出错误
[英]throwing error while converting to object id in nodejs
问题描述
I am working on a task where i am taking the id generated from the database collection and i passing it through the postman.. i am converting that it to database obejct id created and its working accordinlg if we pass correct id else it is throwing an error 
我正在处理一个任务，我正在从数据库集合中生成id并将其传递给邮递员。我正在将它转换为数据库obejct id创建并且如果我们传递正确的id，它的工作accinlg其他它正在抛出一个错误
mongo.get().collection("post").find({"_id":new ObjectId(req.headers.postid)}).toArray(function(err, result) {
if (err) throw err;
if(result.length==0){
jsonObj.response="post id entered is invalid ";
res.send(jsonObj)
}
else{
//some operations
}
}
when ever i am not passing the valid input it is throwing the following error 当我没有传递有效输入时，它会抛出以下错误
<body>
<h1>Argument passed in must be a single String of 12 bytes or a string of 24 hex characters</h1>
<h2></h2>
<pre>Error: Argument passed in must be a single String of 12 bytes or a string of 24 hex characters
at new ObjectID (/home/vamsi/nodejs-training/myfirstproject/facebook/node_modules/bson/lib/bson/objectid.js:51:11)
at Object.handle (/home/vamsi/nodejs-training/myfirstproject/facebook/routes/updatepost.js:36:47)
at next_layer (/home/vamsi/nodejs-training/myfirstproject/facebook/node_modules/express/lib/router/route.js:103:13)
at Route.dispatch (/home/vamsi/nodejs-training/myfirstproject/facebook/node_modules/express/lib/router/route.js:107:5)
at /home/vamsi/nodejs-training/myfirstproject/facebook/node_modules/express/lib/router/index.js:195:24
at Function.proto.process_params (/home/vamsi/nodejs-training/myfirstproject/facebook/node_modules/express/lib/router/index.js:251:12)
at next (/home/vamsi/nodejs-training/myfirstproject/facebook/node_modules/express/lib/router/index.js:189:19)
at Function.proto.handle (/home/vamsi/nodejs-training/myfirstproject/facebook/node_modules/express/lib/router/index.js:234:5)
at Layer.router (/home/vamsi/nodejs-training/myfirstproject/facebook/node_modules/express/lib/router/index.js:23:12)
at trim_prefix (/home/vamsi/nodejs-training/myfirstproject/facebook/node_modules/express/lib/router/index.js:226:17)</pre>
</body>
</html>
3 个解决方案
解决方案1
1 已采纳 2018-03-22 07:10:04
1- 1-
If you're using mongoose, and you're trying to perform a search operation on the basis if _id you don't actually need to convert the passed id to objectId . 如果您正在使用mongoose，并且您尝试在_id的基础上执行搜索操作，则实际上您不需要将传递的id转换为objectId 。 just use 只是用
mongo.get().collection("post")find({"_id" : req.headers.postid })
This won't impose the passed id to be a constructable to monogdb's objectId as objectId in mongo db follows special pattern. 这不会强加传递的id是一个施工的，以monogdb的ObjectID为objectId在蒙戈分贝以下特殊模式。 Like 喜欢
12-byte structure, the first 4 bytes of the ObjectId represent the time in seconds since the UNIX epoch. 12字节结构，ObjectId的前4个字节表示自UNIX纪元以来的秒数。
The next 3 bytes of the ObjectId represent the machine identifier. ObjectId的接下来的3个字节表示机器标识符。
The next 2 bytes of the ObjectId represent the process ID. ObjectId的下两个字节表示进程ID。
And the last 3 bytes of the ObjectId represent a random counter value. 并且ObjectId的最后3个字节表示随机计数器值。
And if your passed id is not constructable to the pattern mentioned above this is definitely gonna throw the errors like you're getting 如果你传递的id不能构造成上面描述的模式，那肯定会抛出你正在获得的错误
2 2
Well I am not very sure about this approach but you can first check if id passed is OK or not with something like 嗯，我不太确定这种方法，但你可以先检查id传递是否正常
var id = null;
try {
id = new ObjectId(req.headers.postid)
mongo.get().collection("post").find({"_id":id}).toArray(function(err, result) {
....
}
catch(error) {
console.error(error);
//there must be error with the id
}
解决方案2
1 2018-03-22 09:00:01
if(!validator.isMongoId(req.headers.postid)){
res.send("invalid post id ")
}
else{
mongo.get().collection("post").find({"_id":new ObjectId(req.headers.postid)}).toArray(function(err, result) {
if (err) throw err;
if(result.length==0){
jsonObj.response="post id entered is invalid ";
res.send(jsonObj)
}
else{
//some operations
}
}
}
before that install validator npm module 在那之前安装验证器npm模块
解决方案3
0 2018-03-22 07:21:21
如果你对和尚没事，你可以使用它。
var Id = require('monk').id(req.headers.postid);
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