Ruby on rails 监视表达式未从ng更改中获取模型更改

我有以下几点 铁路HAML：

 = select_tag "some-class",
                        options_for_select([['None', '']], ''),
                        { class: 'some-other-class',
                          'ng-model' => 'someModel',
                          'ng-options' => 'option.name for option in someList',
                          'ng-change' => 'updateSelected()'}

角度控制器：

  scope.updateSelected = ->
       #logic for updating model lives here. Model updates successfully by using some values defined within scope. Includes the following:
       scope.someModel = "some_new_value"

$scope.someList = [{ name: 'name1' }, { name: 'name2' }];

$scope.destroy1 = "0";
$scope.destroy2 = "0";

角度指令：

  SomeClassDirective= ->
       restrict: 'C'

       link: (scope, element, attrs) ->

            monitorFormFields = (newValue, oldValue) ->
                   console.log "this is the inner function call"
                   #logic for setting the inner _destroy field lives here

            scope.$watch 'someModel', monitorFormFields

但是，当更改Select List值时，“this is the internal function call”（这是内部函数调用）不会打印。它会在指令首次初始化时打印，即在页面加载时打印。因此，我的问题是：$watch表达式为什么不触发，以及如何触发它

谢谢

使用此HTML：

<select class="some-class" ng-model="someModel" 
   ng-options="option.name for option in someList"></select>

控制器：

  scope.updateSelected = ->
       #logic for updating model lives here. Model updates successfully by using some values defined within scope. Includes the following:
       scope.someModel = "some_new_value"

$scope.someList = [{ name: 'name1' }, { name: 'name2' }];

$scope.destroy1 = "0";
$scope.destroy2 = "0";

请注意，您不需要调用控制器方法来更新someModel-Angular会自动为我们这样做，因为ng model属性。因此，指令只需要$watch就可以更改$scope属性

---

我想从元素中获取名称中带有[\u destroy]的同级，并根据选择框的值将其设置为0或1

更具角度的方法是让模型属性控制显示0还是1。例如，在控制器中：

  scope.updateSelected = ->
       #logic for updating model lives here. Model updates successfully by using some values defined within scope. Includes the following:
       scope.someModel = "some_new_value"

$scope.someList = [{ name: 'name1' }, { name: 'name2' }];

$scope.destroy1 = "0";
$scope.destroy2 = "0";

在HTML中：

<div>{{destroy1}}</div>
<div>{{destroy2}}</div>

---

在monitorFormFields中，您可以更改这些作用域属性的值，视图将自动更新-无需查找同级或更新。值。

ng单击支持$event，但是ng的变化似乎没有。有没有关于如何绕过这个限制的建议？也许有一种方法可以在没有事件的情况下做你想做的事情。你想对该事件做什么？我想从元素中获取一个名为[_destroy]的兄弟，并根据select BOX的值将其设置为0或1。你可以$scope。$watch someModel，function{}在选择更改时触发一个处理程序。谢谢！相关信息是，ng更改是不必要的！事实上，改变打破了我的逻辑，不知道为什么，也不完全确定我是否在乎。至于破坏，我很感兴趣，将去重写它。非常感谢。