arrays - 配列から合計を計算する

Question

weeklyAmounts子オブジェクトで定義されたフロートの配列がありますa。そして、親 objectbには object の配列がありa、すべての子 object から week1 の小計を計算し、すべての子 object から week2 の小計を計算する必要がありaますa。

私の質問:

1. ノックアウトのドキュメントを読むと、監視可能な配列は削除や追加などのイベントで追跡されますが、個々のオブジェクトの状態の変化は追跡されないため、私の場合、ユーザーがweek1AmountGUI から変更したとしても、計算された値はトリガーされません。本当？
2. week1AmountGUI から変更した後、viewmodel で値が変更されていないことに驚きました。ここで何か見逃しましたか？
3. 何が必要かを考えると、最適なソリューションは何ですか?

私の動作しないコードは次のとおりです。

function a(id, name, week1Amount, week2Amount, week3Amount, week4Amount,
week5Amount, week6Amount, week7Amount, week8Amount, week9Amount, week10Amount...) {
var self = this;
self.id = id;
self.name = name;
  self.week1Amount = ko.observable(week1Amount);
  self.week2Amount = ko.observable(week2Amount);
  self.week3Amount = ko.observable(week3Amount);
  self.week4Amount = ko.observable(week4Amount);
  self.week5Amount = ko.observable(week5Amount);
  self.week6Amount = ko.observable(week6Amount);
  self.week7Amount = ko.observable(week7Amount);
  self.week8Amount = ko.observable(week8Amount);
  self.week9Amount = ko.observable(week9Amount);
  self.week10Amount = ko.observable(week10Amount);
  self.week11Amount = ko.observable(week11Amount);
  self.week12Amount = ko.observable(week12Amount);
    };


    function b(bid, bname, as) {
    var self = this;
  self.id= bid;
  self.name = bname;
  self.as = as;
  self.week1Sum = ko.computed(function () {
      var sum = 0.0;
      $(self.as).each(function (index, aItem) {
        sum += aItem.week1Amount();
      });
      return sum;
  });
    //rest of code is omitted for brevity. 
    };

      var objBs = [];

      $(objAs).each(function (index, aItem) {
        var newA = new a(aItem.ID, aItem.Name,  
    aItem.WeeklyAmount[0],aItem.WeeklyAmount[1],aItem.WeeklyAmount[2],aItem.WeeklyAmount[3],
    aItem.WeeklyAmount[4],aItem.WeeklyAmount[5],aItem.WeeklyAmount[6],....);
    objBs.push(newA);
    });

var vmB = new b(1,"someName", objBs);

    ko.applyBindings(vmB, document.getElementById("showBs"));