Ionic "track by" error with tinder cards -


i started learning ionic 2 weeks ago , right creating small project practice.you can download project github : https://github.com/kaanyildirim/ionictest

i trying use tinder cards created ionic team itself. (https://github.com/driftyco/ionic-ion-tinder-cards)

i have tried every possible solution "track by" expression still getting error:

error: [ngrepeat:dupes] duplicates in repeater not allowed. use 'track by' expression specify unique keys. repeater: card in cards track card.id, duplicate key: undefined, duplicate value: undefined

i have tried fix error "track $index" , "track card.id "(every card has "id" attribute in .json file) didn't worked. guess made small mistake , can't find it.

can please me? thanks

index.html:

 	  <td-cards>        <td-card ng-repeat="card in cards track card.id" on-destroy="carddestroyed($index)" on-swipe="cardswiped($index)">          <div class="list card mycard">              <!-- card header-->            <div class="item topicdescription cardheader">               <p>{{card.topicdescription}}</p>            </div>              <!-- card body-->            <div class="item item-body noborder">              <img class="full-image" src="{{card.image}}">              <h3 class="cardtitle">{{card.title}}</h3>              <p>{{card.summary}}</p>              </div>              <!-- card footer-->            <div class="item tabs tabs-secondary tabs-icon-left cardfooter">               <a class="tab-item" ng-click="readmore($index)" href="#">                   <i class="{{card.actionbuttonicon}}"></i>                   {{card.actionbuttontext}} {{card.type}} ( {{card.additionalinfo}} )               </a>                 <a class="tab-item" ng-click="share($index)" href="#">                  <i class="icon ion-share"></i>                  share                </a>            </div>          </div>        </td-card>      </td-cards>

json file: 

{    "articles": [      {        "id":1,        "topicdescription": "find idea",        "image": "img/uber.jpg",        "title": "uber lowers fares in on 100 cities",        "summary": "uber lowering prices in on 100 u.s. , canadian cities, effective tomorrow. january slower month car service , company says reducing fares in order increase demand.",        "link": "http://techcrunch.com/2016/01/08/uber-lowers-fares-in-over-100-cities/",        "actionbuttonicon": "icon ion-ios-glasses-outline",        "actionbuttontext": "read",        "type":"article",        "additionalinfo": "3 min"      },      {        "id":2,        "topicdescription": "test idea",        "image": "img/lean.jpg",        "title": "the lean startup",        "summary": "great book startups , how validate idea without spending money , time.",        "link": "http://www.amazon.de/lean-startup-innovation-successful-businesses/dp/0670921602/ref=sr_1_2?ie=utf8&qid=1452779528&sr=8-2&keywords=the+lean+startup",        "actionbuttonicon": "icon ion-ios-bookmarks-outline",        "actionbuttontext": "buy",        "type":"book",        "additionalinfo": "amazon"      },      {        "id":3,        "topicdescription": "build",        "image": "img/evernote.jpg",        "title": "note taking app",        "summary": "from short lists lengthy research, no matter form writing takes, evernote keeps focused on moving ideas inspiration completion.",        "link": "https://evernote.com/?var=3",        "actionbuttonicon": "icon ion-hammer",        "actionbuttontext": "download",        "type":"app",        "additionalinfo": "app store"      },      {        "id":4,        "topicdescription": "measure",        "image": "img/steve.jpg",        "title": "steve blank: how build great company",        "summary": "join silicon valley serial entrepreneur-turned-educator blank in lively discussion dan'l lewin of microsoft. program introduce best practices, lessons , tips have swept startup world, offering wealth of proven advice , information entrepreneurs of stripes.",        "link": "https://www.youtube.com/watch?v=1rtcxwjucau",        "actionbuttonicon": "icon ion-ios-videocam-outline",        "actionbuttontext": "watch",        "type":"video",        "additionalinfo": "youtube"      },      {        "id":5,        "topicdescription": "find idea",        "image": "img/uber.jpg",        "title": "uber lowers fares in on 100 cities",        "summary": "uber lowering prices in on 100 u.s. , canadian cities, effective tomorrow. january slower month car service , company says reducing fares in order increase demand.",        "link": "http://techcrunch.com/2016/01/08/uber-lowers-fares-in-over-100-cities/",        "actionbuttonicon": "icon ion-ios-glasses-outline",        "actionbuttontext": "read",        "type":"article",        "additionalinfo": "3 min"      },      {        "id":6,        "topicdescription": "test idea",        "image": "img/lean.jpg",        "title": "the lean startup",        "summary": "great book startups , how validate idea without spending money , time.",        "link": "http://www.amazon.de/lean-startup-innovation-successful-businesses/dp/0670921602/ref=sr_1_2?ie=utf8&qid=1452779528&sr=8-2&keywords=the+lean+startup",        "actionbuttonicon": "icon ion-ios-bookmarks-outline",        "actionbuttontext": "buy",        "type":"book",        "additionalinfo": "amazon"      },      {        "id":7,        "topicdescription": "build",        "image": "img/evernote.jpg",        "title": "note taking app",        "summary": "from short lists lengthy research, no matter form writing takes, evernote keeps focused on moving ideas inspiration completion.",        "link": "https://evernote.com/?var=3",        "actionbuttonicon": "icon ion-hammer",        "actionbuttontext": "download",        "type":"app",        "additionalinfo": "app store"      },      {        "id":8,        "topicdescription": "measure",        "image": "img/steve.jpg",        "title": "steve blank: how build great company",        "summary": "join silicon valley serial entrepreneur-turned-educator blank in lively discussion dan'l lewin of microsoft. program introduce best practices, lessons , tips have swept startup world, offering wealth of proven advice , information entrepreneurs of stripes.",        "link": "https://www.youtube.com/watch?v=1rtcxwjucau",        "actionbuttonicon": "icon ion-ios-videocam-outline",        "actionbuttontext": "watch",        "type":"video",        "additionalinfo": "youtube"      }    ]  }

i examined code. in controllers.js file handle cardswiped event manually adding undefined card list

$scope.cardswiped = function(index) {         var newcard = // new card data          $scope.cards.push(newcard);     };

this causes cards have multiple undefined elements ng-repeat forced handle duplicates. remove/fix handler , things should work.

btw, code work because javascript handle them single line var newcard = $scope.cards.push(newcard); means @ end of function newcard variable have new length of cards array.


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