Spring + AngularJS 連想配列 データ表示

Question

勤怠情報が表示させるWebappをSpring にてJava とAngularJS にて作っています。勤怠勤怠勤怠、attendanceのデータが表示しているhtmlの一覧が以下のようにあります。
日付（date） | 名前 （lastname firstname） | 出勤 | 退勤

上記をクリックすると（Angularjs のng-show にて）以下の情報が表示されるようにしたいのです。

交通手段： (vehicle)

条件としてはattendanceのstaff.id とdataのstaff.id が同じ(紐付け)で、日付が同じことが要求されます。

問題としてはattendanceのコントローラしたに以下のdataのような連想配列を function(dataList) {}にて取り出した時に
staff.id とdate キーとして連想配列を作りたいのですが、エラーが出てしまいます。
「Cannot read property '2016-5-27' of undefined」

var attendance ={
    "obj1":{"date":"2016-05-27","staff":{"id":"01","dep":"sales", "firstname":"taro", "lastname":"honda"},"出勤":"09:00:00","退勤":"18:00:00"},
    "obj2":{"date":"2016-05-27","staff":{"id":"02","dep":"engineer","firstname":"ryo", "lastname":"suzuki"},"出勤":"10:00:00","退勤":"20:00:00"},
    "obj3":{"date":"2016-05-27","staff":{"id":"06","dep":"engineer","firstname":"hanako", "lastname":"matsumoto"},"出勤":"09:00:00","退勤":"18:00:00"},
    "obj4":{"date":"2015-01-02","staff":{"id":"07","dep":"sales","firstname":"yuki", "lastname":"hara"},"出勤":"10:00:00","退勤":"20:00:00"}
};
var dataList ={
    "data1":{"date":"1464274800000","name":{"first":"fist1","last":"last1"},"vehicle":"car", "staff":{"id":"01","dep":"sales", "firstname":"taro", "lastname":"honda"}},
    "data2":{"date":"1464274800000","name":{"first":"fist2","last":"last2"},"vehicle":"car", "staff":{"id":"02","dep":"engineer","firstname":"ryo", "lastname":"suzuki"}},
    "data3":{"date":"1464274800000","name":{"first":"fist3","last":"last3"},"vehicle":"train","staff":{"id":"03","dep":"bookkeeper","firstname":"ken", "lastname":"hitachi"}},
    "data4":{"date":"1464274800000","name":{"first":"fist4","last":"last4"},"vehicle":"train", "staff":{"id":"04","dep":"engineer","firstname":"sho", "lastname":"kikuchi"}},
    "data5":{"date":"1465225200000","name":{"first":"fist5","last":"last5"},"vehicle":"train", "staff":{"id":"01","dep":"sales","firstname":"taro", "lastname":"honda"}}
};

       document.write(key, ':', value+"<>");

for (var i = 0; i < data.length; i++) {
          var data = data[i];
          var d = new Date(data.date);
            yyyy = d.getFullYear();
            mm = d.getMonth()+1;
            ss = d.getDate();
            var keydate = yyyy+"-"+mm+"-"+ss;

            if ($scope.MapByStaffId[data.staff.id][keydate] == null) {
              $scope.MapByStaffId[data.staff.id][keydate] = {};
            }

            if($scope.MapByStaffId[data.staff.id][keydate][data.vehicle] == null) {
              $scope.MapByStaffId[data.staffDto.id][keydate][data.vehicle] = {
                vehicle: angular.copy(data.vehicle)
              };
            }
}