查询JSON对象？

Question

我试图使用下划线库查询JSON对象，但我无法查询下面的JSON结构。 ＆＃39; $ scope.conScopeFreqStartDates＆＃39;变量具有以下JSON值。

我正在传递＆＃39; frequencyCodeInput＆＃39;价值有＆＃39; Y＆＃39;在下划线脚本中。

    [
       {
          "consolidationScopeId": 4008,
          "consolidationScopeCode": "S",
          "consolidationScopeLabel": "Individual",
          "frequencies": [
             {
                "frequencyCode": "M",
                "frequencyLabel": "Monthly",
                "startDates": [
                   "2016-01-31",
                   "2016-02-28"
                ]
             },
             {
                "frequencyCode": "Y",
                "frequencyLabel": "Annual",
                "startDates": [
                   "2016-12-31",
                   "2017-12-31"
                ]
             }
          ]
       }]

我正在尝试从JSON对象中获取startDates，

控制器

var startDates = _.findWhere($scope.conScopeFreqStartDates, {
            'frequencies.frequencyCode': frequencyCodeInput
        }).startDates;

        $scope.startDates = startDates;

＆＃39; startDates＆＃39;我的上述代码未定义。

Answer 1

我会在对象的频率数组上调用_.findWhere，而不是整个对象

var startDates = _.findWhere($scope.conScopeFreqStartDates.frequencies, {
            'frequencyCode': frequencyCodeInput
        }).startDates;

        $scope.startDates = startDates;