angularjs - Angular ng 重复错误 "Duplicates in a repeater are not allowed."

Question

我正在定义一个自定义过滤器，如下所示:

<div class="idea item" ng-repeat="item in items" isoatom>    
    <div class="section comment clearfix" ng-repeat="comment in item.comments | range:1:2">
        ....
    </div>
</div>

正如您所看到的，使用过滤器的 ng-repeat 嵌套在另一个 ng-repeat 中

过滤器定义如下:

myapp.filter('range', function() {
    return function(input, min, max) {
        min = parseInt(min); //Make string input int
        max = parseInt(max);
        for (var i=min; i<max; i++)
            input.push(i);
        return input;
    };
});

我得到:

Error: Duplicates in a repeater are not allowed. Repeater: comment in item.comments | range:1:2 ngRepeatAction@https://ajax.googleapis.com/ajax/libs/angularjs/1.1.4/an

Answer 1

解决方案实际上描述如下:http://www.anujgakhar.com/2013/06/15/duplicates-in-a-repeater-are-not-allowed-in-angularjs/

AngularJS 不允许 ng-repeat 指令中存在重复项。这意味着如果您尝试执行以下操作，您将收到错误。

// This code throws the error "Duplicates in a repeater are not allowed.
// Repeater: row in [1,1,1] key: number:1"
<div ng-repeat="row in [1,1,1]">

但是，稍微更改上面的代码以定义一个索引来确定唯一性，如下所示，将使其再次工作。

// This will work
<div ng-repeat="row in [1,1,1] track by $index">

官方文档在这里:https://docs.angularjs.org/error/ngRepeat/dupes