错误:[ngRepeat:dupes]这是什么意思?

Question

repeat指令从api输出葡萄酒记录。我有一个工厂函数来提供葡萄酒API，然后在我的控制器

中访问它

app.factory("Wine", function ($http){
     var factory = {};
     //getWines 
     factory.getWines = function(){ 
      return $http.get("http://www.greatwines.9000.com")
     }
}

控制器:

    app.controller("winesCtrl", function($scope, $http, Wine){
        Wine.getWines()
         .success(function(wines){
           $scope.wines = wines;
        })
        .error(function(){
             alert("Error!");
         });
    });
VIEW:
<h2>Wine list</h2>
    <div class="row margin-top-20 wine-container" ng-repeat="wine in wines">
        <div class="col-sm-3">
            <img src="{{wine.picture}}" class="img-responsive" />
        </div>
        <div class="col-sm-9">
            <div class="margin-top-20">
                <span class="bold">Name: </span><span>{{wine.name}}</span>
            </div>
            <div>
                <span class="bold">Year: </span><span>{{wine.year}}</span>
            </div>
            <div>
                <span class="bold">Grapes: </span><span>{{wine.grapes}}</span>
            </div>
            <div>
                <span class="bold">Country: </span><span>{{wine.country}}</span>
            </div>
            <div>
                <span class="bold">Region: </span><span>{{wine.region}}</span>
            </div>
            <div>
                <span class="bold">Price: </span><span>{{wine.price}}</span>
            </div>
            <div>
                <span class="bold">{{wine.description}}</span>
            </div>
            <div class="margin-top-20">
                <a href="#/wines/{{wine.id}}" class="btn btn-default">Edit Wine</a>
            </div>
        </div>
    </div>

我点击了这个错误，在典型的"模糊"angularjs风格中，我得到了这个:

Duplicates in a repeater are not allowed. Use 'track by' expression to specify unique keys. Repeater: wine in wines, Duplicate key: string:e, Duplicate value: e

这是什么意思?葡萄酒和"葡萄酒"不一样，为什么它认为它是复制品呢?

Answer 1

确实，AngularJS使用键来关联DOM节点和项。因此，您可以通过添加"track by $index"来求解。

它看起来像这样

ng-repeat="wine in wines track by $index"

Answer 2

如果在一个ngRepeat表达式中有重复的键时发生。重复的键是被禁止的，因为AngularJS使用键来关联DOM节点和项。

表示$scope。葡萄酒的某些值是重复的。

你也可以参考这篇文章:Angular ng-repeat Error "重复器中的重复是不允许的。"