主干集合无法删除项目

我有一个名为Delivery的主干模型。然后，我创建了一个由 LocalStorage 支持的名为 DeliveryList 的交付集合。在我的Marionette.ItemView中，用于显示集合中的项目，我有一种删除项目的方法：

    removeDeliveryOption: function() {
        Deliveries.remove(this.model.get("id"));
    }

出于某种原因，当我单击删除按钮时，这会从 Marionette.CompositeView 中删除该项目，但是当我重新加载页面时，相同数量的项目总是会重新出现。

值得注意的是，当我删除该项目时，它总是以默认选项名称"免费送货"重新出现。我在模型中同时使用默认值和模式，因为我使用的是骨干表单插件 （https://github.com/powmedia/backbone-forms）。

任何帮助将不胜感激！

var Delivery = Backbone.Model.extend({
    defaults: function () {
        return {
            order: Deliveries.nextOrder(),
            optionName: "Free Delivery",
            shipToState: "Hawaii",
            zipCodes: "96813",
            perOrderFee: "0.00",
            perItemFee: "0.00"
        };
    },
    schema: {
        optionName: { type: 'Text', validators: ['required'] },
        shipToState: { type: 'Select', options: getStateNames(), validators: ['required'] },
        zipCodes: { type: 'Text', validators: ['required'] },
        perOrderFee: { type: 'Text', validators: ['required'] },
        perItemFee: { type: 'Text', validators: ['required'] },
    }
});
var DeliveryList = Backbone.Collection.extend({
    model: Delivery,
    localStorage: new Backbone.LocalStorage("deliverylist-backbone"),
    nextOrder: function () {
        if (!this.length) return 1;
        return this.last().get('order') + 1;
    },
    comparator: 'order'
});
var Deliveries = new DeliveryList;
var deliveryView = Marionette.ItemView.extend({
    //tagName: "li",
    template: "#delivery-item-template",
    events: {
        "click #removeThis": "removeDeliveryOption",
    },
    removeDeliveryOption: function() {
        Deliveries.remove(this.model.get("id"));
    }
});
var DeliveriesView = Marionette.CompositeView.extend({
    initialize: function() {
        Deliveries.fetch();
    },
    template: '#deliveries-view-template',
    itemView: deliveryView,
    events: {
        "click #addShipping": "addDeliveryOption",
    },
    addDeliveryOption: function() {
        var editDeliveryForm = new Backbone.Form({
            template: _.template($("#editDeliveryTemplate").html()),
            model: Deliveries.create()
        }).render();
        this.$el.append(editDeliveryForm.el);
        $("#triggerEditDelivery").fancybox({
            'afterClose': function () {
                commitForm(editDeliveryForm);
                //Wait do display the inlineModel until here
                // Once we've bound the form to the model, put the saving logic with the collection
                //Deliveries.last().save();
            }
        }).trigger('click');
    },
    // Specify a jQuery selector to put the itemView instances in to
    itemViewContainer: "#deliveries",
});

编辑感谢@ejosafat！不得不销毁模型，而不仅仅是从集合中删除。

removeDeliveryOption: function() {
    this.model.destroy();
}