node.js - redirect after a POST to mongodb not working -

i'm going crazy!

i'm writing simple messageboard node/mongodb user can open threads , comment on them. after post /newthread, inserts data db (which works), have redirect _id of document, server crashes "cannot read posttitle of undefined".

if restart server , navigate thread (which shown on index-page, correctly inserted), can view thread without problem.

only after insert , redirect, there seems no document found. can't figure out why, can help?

//index.js router.post('/newthread', function(req, res) {     threads.save(req, res); });  //threads.js  var db = require('./db'); var uri = 'mongodb://localhost:27017/project'; var coll = 'documents'; var oid = require('mongodb').objectid;     module.exports.loadall = function(cb) {        db(uri, {}, function(err, db) {            db.collection(coll, function(err, collection) {                collection.find(                {                    $query: {},                    $orderby: { "bumpedat": -1 }                }             ).toarray(function(err, items) {                 console.log("found items: " + items.length);                 cb(null, items);             })        });    }) };  module.exports.loadone = function(id, cb) {     db(uri, {}, function(err, db) {     db.collection(coll, function(err, collection) {         if (err) {             console.log(err);         } else {             console.log("searching id: " + id);             console.log("converted oid: " + new oid(id));             collection.findone({                 _id: new oid(id)             }, {}, function(err, item) {                 if (err) {                     console.log("error " + err);                     cb(err);                 } else if (item) {                     console.log("found item!");                     console.dir(item);                     cb(null, item);                 } else {                     console.log("found no items");                     cb(err);                  }             })          }      })     }) };  module.exports.save = function(req, res) { db(uri, {}, function(err, db) {     db.collection(coll, function(err, collection) {          var time = new date();          console.log("saving...");         collection.insert({             "op"            : req.body.username ||"anonymous",             "posttitle"     : req.body.posttitle || "no title",             "postcontent"   : req.body.postcontent,             "createdat"     : time,             "bumpedat"      : time,             "comments"      : []         }, function (err, doc) {             if (err) {                 res.send ("error while saving post.")             } else {                 console.log("saved!");                 console.dir(doc);                 var threadid = new oid(doc._id).tostring();                 res.location('/thread/' + threadid);                 console.log("reloacting " + threadid);                 res.redirect('/thread/' + threadid);                 console.log("redirecting " + threadid);             }         })     }) }) };   //thread.js (route /thread/:id) router.get('/:id', function(req, res) {     console.log("loading " + req.params.id);     threads.loadone(req.params.id, function(err, item) {     if (err) {         console.log(err);     } else {         res.render('showthread', {             title: item.posttitle,             posts: item         })     }      }) }); 

console output saving thread is:

saving... saved! {result: { ok: 1, n: 1 },     // ... } relocating 557d2305be8e753b0e0cf70a redirecting 557d2305be8e753b0e0cf70a post /newthread 302 96.992 ms - 120 loading 557d2305be8e753b0e0cf70a searching id: 557d2305be8e753b0e0cf70a converted oid: 557d2305be8e753b0e0cf70a found no items typeerror: cannot read property 'posttitle' of undefined     @ [...]/thread.js:16:28 

(that's @ "title: item.posttitle,")

am accessing wrong?

the id read, , correct. on index, links generated _id, totally correct. if click index link, can see thread. redirected (after post) url shows correct link (with same id), can't loadone id after posting... why??