MongoDB - IDまたは他のフィールドでエントリを検索します

Question

MongoDBとMongooseを使用してNode.JSアプリケーションを作成しています。私が直面した問題の1つは、その要素をそのObjectIDまたはurlフィールドのいずれかで探す必要があることです。私はそれをこのように書くことを試みた：

const mongoose = require('mongoose'); 
const ObjectID = mongoose.Types.ObjectId; 

Event 
    .findOne({ $or: [ 
    { _id: new ObjectID('hello) }, 
    { url: 'hello }, 
    ] }) 
    // doing domething with the result 

しかし文字列が有効なObjectIDでない場合、プログラムがクラッシュする、それが有効ObjectID文字列ではありませんと言って：私が削除されます場合は

Error: Argument passed in must be a single String of 12 bytes or a string of 24 hex characters 
     at new ObjectID (/usr/app/oms-events/node_modules/bson/lib/bson/objectid.js:34:11) 
     at Server.exports.fetchSingleEvent (/usr/app/oms-events/lib/middlewares.js:178:14) 
     at next (/usr/app/oms-events/node_modules/restify/lib/server.js:912:30) 
     at f (/usr/app/oms-events/node_modules/once/once.js:25:25) 
     at Request.httprequest [as _callback] (/usr/app/oms-events/lib/middlewares.js:165:14) 
     at Request.self.callback (/usr/app/oms-events/node_modules/request/request.js:186:22) 
     at emitTwo (events.js:106:13) 
     at Request.emit (events.js:191:7) 
     at Request.<anonymous> (/usr/app/oms-events/node_modules/request/request.js:1081:10) 
     at emitOne (events.js:96:13) 
     at Request.emit (events.js:188:7) 
     at IncomingMessage.<anonymous> (/usr/app/oms-events/node_modules/request/request.js:1001:12) 
     at IncomingMessage.g (events.js:292:16) 
     at emitNone (events.js:91:20) 
     at IncomingMessage.emit (events.js:185:7) 
     at endReadableNT (_stream_readable.js:974:12) 
Program node /usr/app/oms-events/lib/server.js exited with code 1 

ここのようなオブジェクトIDへの変換、：

は

Event 
    .findOne({ $or: [ 
     { _id: 'hello' }, 
     { url: 'hello' }, 
    ] }) 

それはまたCastErrorでクラッシュします：

{ MongooseError: Cast to ObjectId failed for value "hello" at path "_id" 
    at CastError (/usr/app/oms-events/node_modules/mongoose/lib/error/cast.js:26:11) 
    at ObjectId.cast (/usr/app/oms-events/node_modules/mongoose/lib/schema/objectid.js:147:13) 
    at ObjectId.castForQuery (/usr/app/oms-events/node_modules/mongoose/lib/schema/objectid.js:187:15) 
    at cast (/usr/app/oms-events/node_modules/mongoose/lib/cast.js:218:32) 
    at cast (/usr/app/oms-events/node_modules/mongoose/lib/cast.js:36:18) 
    at model.Query.Query.cast (/usr/app/oms-events/node_modules/mongoose/lib/query.js:2741:10) 
    at model.Query.Query.findOne (/usr/app/oms-events/node_modules/mongoose/lib/query.js:1354:10) 
    at /usr/app/oms-events/node_modules/mongoose/lib/query.js:2300:21 
    at model.Query.exec (/usr/app/oms-events/node_modules/mongoose/lib/query.js:2294:17) 
    at Server.exports.fetchSingleEvent (/usr/app/oms-events/lib/middlewares.js:182:6) 
    at next (/usr/app/oms-events/node_modules/restify/lib/server.js:912:30) 
    at f (/usr/app/oms-events/node_modules/once/once.js:25:25) 
    at Server.exports.fetchUserDetails (/usr/app/oms-events/lib/middlewares.js:92:12) 
    at next (/usr/app/oms-events/node_modules/restify/lib/server.js:912:30) 
    at f (/usr/app/oms-events/node_modules/once/once.js:25:25) 
    at UserCache.findOne (/usr/app/oms-events/lib/middlewares.js:85:12) 
message: 'Cast to ObjectId failed for value "hello" at path "_id"', 
name: 'CastError', 
kind: 'ObjectId', 
value: 'hello', 
path: '_id', 
reason: undefined } 

したがって、問題は次のとおりです。ObjectIDまたはurlフィールドで要素を見つけるにはどうすればよいですか？

Answer 1

私は、このようにそれを行うことを決めた。

let id = 'hello' 

// Checking if the passed ID is ObjectID or not. 
// I decided not to use ObjectID.isValid method, since it's not always 
// working properly, see http://stackoverflow.com/a/29231016/1206421 
let findObject; 
if (id.match(/^[0-9a-fA-F]{24}$/)) { // if it's indeed an ObjectID 
    findObject = { _id: id }; 
} else { 
    findObject = { url: id }; 
} 

return Event 
    .findOne(findObject) 
    // doing something with the result