angularjs - Adding Tags work on create page, but wont work on edit page angular -

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i'm trying build app meanjs of uses angular. idea user able add tags , delete tags post. add , deleting works great on create page once try add or delete on edit post page doesn't work anymore.

below html 

<section data-ng-controller="productscontroller" data-ng-init="findone()"> <div class="page-header">     <h1>edit product</h1> </div> <div class="col-md-12">     <form class="form-horizontal" data-ng-submit="update()" novalidate>         <fieldset>             <div class="form-group">                 <div class="controls">                     <label class="control-label" for="name">name</label>                     <input type="text" data-ng-model="product.name" id="name" class="form-control" placeholder="name" required>             <div class="tag-input-ctn">                 <div data-ng-repeat="(key, tag) in product.tags" class="input-tag">                             {{ tag.name }}                             <div class="delete-tag" data-ng-click="deletetag(key)">&times;</div>                         </div>                          <input type="text" data-tag-input="" data-ng-model="newtag" data-ng-style="{width: inputwidth}" data-new-tag="addtag()" data-delete-tag="deletetag()">                     </div>                 </div>             </div>             <div class="form-group">                 <div ng-click="update()" value="update" class="btn btn-default">update</div>             </div>             <div data-ng-show="error" class="text-danger">                 <strong data-ng-bind="error"></strong>             </div>         </fieldset>     </form> </div>

below controller

angular.module('products').controller('productscontroller', ['$scope', '$stateparams', '$location', 'authentication', 'products', function($scope, $stateparams, $location, authentication, products) {     $scope.authentication = authentication;      $scope.tags = [];     $scope.addtag = function() {         if ($scope.newtag.length === 0) {             return;         }           $scope.tags.push({name: $scope.newtag});         console.log('addtag ran');         $scope.newtag = '';     };      $scope.deletetag = function(key) {         if ($scope.tags.length > 0 &&             $scope.newtag.length === 0 &&             key === undefined) {             $scope.tags.pop();         } else if (key !== undefined) {             $scope.tags.splice(key, 1);             console.log('tagspops');         }     };

i can see logs when enter tags , click on x's, nothing happens on page, yet works fine if i'm creating post.

please me thanksss


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