javascript - Can't get Firebase update() to work with provided object -

ok, after lot of trial , error have try asking here. i'm trying update firebase entry , code this,

this service.js:

//this dosn't work var updateitem = function (item, id) {     var ref  = new firebase(firebase_uri + '/lessons/' + id);     ref.$update(item); }  //this works (items ref new firebase(firebase_uri + '/lessons/'); var additem = function (item) {     items.$add(item); } 

and controller:

$scope.updatelesson = function (item) {     lessonsservice.updatelesson(item, id); } 

the error i'm getting this:

error: firebase.set failed: first argument contains invalid key ($id). keys must non-empty strings , can't contain ".", "#", "$", "/", "[", or "]"

the object i'm passing in looks this:

object {     $id: "-jliuvvmlqocvghaed9f",      $bind: function, $add: function, $save: function,     $set: function…}     $add: function (item) {     $auth: function (token) {     $bind: function (scope, name, defaultfn) {     $child: function (key) {     $getindex: function () {     $getref: function () {     $id: "-jliuvvmlqocvghaed9f"     $off: function (type, callback) {     $on: function (type, callback) {     $remove: function (key) {     $save: function (key) {     $set: function (newvalue) {     $transaction: function (updatefn, applylocally) {     $update: function (newvalue) {     createdate: "2014-04-24t11:29:42.692z"     desc: "test"     somemorevalues: "here" } 

i have tried json.stringify on object , got nice looking result looking this:

 {   createdate: "2014-04-24t11:29:42.692z",   desc: "test",   somemorevalues: "here"  } 

but wont accept when i'm passing in thru variable. (error: firebase.update failed: first argument must object containing children replace.) if pass in directly string works thou (?!!!). it's exact same information in variable.. hell missing?! of i'm building own object this:

 var newitem = {      title: item.title,      desc: item.desc,      ingress: item.ingress,      workarea: item.workarea,      years: {val: item.years.val},  } 

and passing along firebase, works not ideal because "static".

use angularfire according the api. read angular+firebase overview primer.

in essence, instead of passing angularfire objects firebase ref (which not work since keys may not have $ in name) , calling update/set yourself, use $set/$update methods available on $firebase object:

var ref = $firebase(url); ref[id].desc = 'foo'; ref.$save(id).then(oncomplete);