Error: [ngRepeat:dupes] Duplicates in a repeater are not allowed. Use 'track by' expression to specify unique keys.
もともと：
<a class = "item item-thumbnail-left" ng-repeat="story in stories track by story.id" href="{{story.url}}" target="_blank">
エラー：
ionic.bundle.js
Error: [ngRepeat:dupes] Duplicates in a repeater are not allowed. Use 'track by' expression to specify unique keys.
解決：
<a class = "item item-thumbnail-left" ng-repeat="story in stories track by $index" href="{{story.url}}" target="_blank">
参考
