Knockout View模型重置 - 当Observables需要默认值时

让我们说我有以下简化和通用视图模型,它使用KnockoutJS和Knockout Validation库分别创建/操作和验证observable.

// view declared

// KnockoutJS loaded
// KnockoutValidation loaded

var ChildNodePropertiesVM = function(properties) {
    var self = this;

    /* data within properties object are assigned to
       observables within VM */
};

var ChildNode = function() {
    var self = this;
    var options = // data from ajax request sent to web service

    // list of POJOs
    this.availableParentNodes = ko.observableArray();

    // a specific POJO from the list above, selected from an HTML select element
    // Knockout Validation ensures that a value is present (required)
    this.associatedParentNode = ko.observable().extend({
        required: {
            params: true,
            message: "Please choose a parent"
        }
    });

    // a view model, declared above, constructed with value from options
    this.childProperties = new ChildNodePropertiesVM(options.childProps);

    /* Many more model-members follow, and may be any of the above types
       (observable, observableArray, view model, etc) */
};

// apply bindings to view here (in this case, ko.applyBindingsWithValidation)

我感兴趣的是,如果我想创建一个"重置"程序来清除视图模型的大多数成员(其中可能有很多),并保留少数字段,那么是什么我能做到最可维护的方式吗？更具体地说,将availableParentNodes对象视为我想要保留的可观察对象之一,同时associatedParentNode必须清除(如,self.associatedParentNode(undefined)),并且必须将一半(未声明的)模型成员childProperties设置为null,作为一部分重置过程.

SO和搜索引擎查询建议手动清除每个可观察/变量,或者ChildNode仅创建新视图模型(在本例中为视图模型)以替换旧视图模型.由于我有特定的字段,我想保留,后者不是一个选项,因为这些模型中有很多可观察的,前者是不可维护的.