EntityManager.createEntity（） - 策略表示用于用户输入生成的ID和默认值

我有2个entites的1：M关系。

Vehicle (Id, RetailPrice, StockOn, VehicleInfoId) and 
VehicleInfo (Id, Year, Make, Model, ICollection<Vehicle>)

这两个ID是用户指定的（串），而是因为微风需要独特的键（哪怕是暂时的）我要创建与实体id = breeze.core.getUuid() 此外，年份和RetailPrice被设置为0（年份是int，RetailPrice是十进制）。

有一次，我结合这些实体的“新车形式”这些值immediatelly显示给用户的时候，其实我想他们是空白...什么是处理的最佳方式？有些想法，我有如下：

添加额外的性能（通过初始值设定），并使用这些在表格上结合。然后保存之前，交换性能。
“消灭”这些在初始化（不是构造函数）特性....
使用自定义KO结合处理可能？

有没有更好的办法？

这里是我到目前为止（使用＃2，但我不知道这是正确的）

/viewmodels/vehicleadd.js

var vehicle = ko.observable();
var viewModel = {
    title: 'Add New Vehicle',
    vehicle: vehicle,
};
return viewModel;
function activate() {
    vehicle(datacontext.createVehicle());
}

/services/datacontext.js

function init() {
    logger.debug(datacontext, 'Initializing data context...');
    return manager.fetchMetadata()
        .then(model.configureMetadataStore(manager.metadataStore))
        .then(model.applyValidators)
        //.then(loadLookups)
        .fail(initFailed);
}

function createVehicle() {
 var newVehicleInfo = manager.createEntity('VehicleInfo');
 var newVehicle = manager.createEntity('Vehicle');
 newVehicle.vehicleInfo(newVehicleInfo);

 return newVehicle;
}

/services/model.js

function configureMetadataStore(metadataStore) {
    logger.debug(model, 'Configuring metadata store...');
    extendVehicle(metadataStore);
    extendVehicleInfo(metadataStore);
}

function extendVehicle(metadataStore) {
    // --- custom constructor ---
    var vehicleCtor = function () {
        this.id = ko.observable(breeze.core.getUuid()); // must have for Breeze to work...
    };
    // --- initializer ---
    var vehicleInitializer = function (vehicle) {
        // defaults
        vehicle.id(null);                       // user to input
        vehicle.retailPrice(null);              // user to input
        vehicle.stockedOn(moment().format());   // set to current date & time
        // additional, non persisted properties
        vehicle.isBeingEdited = ko.observable(false);
        vehicle.isBeingSaved = ko.observable(vehicle.entityAspect.isBeingSaved);             
    };
    // --- register custom ctor & initializer ---
    metadataStore.registerEntityTypeCtor(EntityNames.Vehicle, vehicleCtor, vehicleInitializer);
}

function extendVehicleInfo(metadataStore) {
    // --- custom constructor ---
    var vehicleInfoCtor = function () {
        this.id = ko.observable(breeze.core.getUuid());
    };
    // --- initializer ---
    var vehicleInfoInitializer = function (vehicleInfo) {
        // defaults
        vehicleInfo.year = ko.observable(moment().format());
        // additional, non persisted properties
        vehicleInfo.isBeingEdited = ko.observable(false);
        vehicleInfo.isBeingSaved = ko.observable(vehicleInfo.entityAspect.isBeingSaved);
        // computed properties
        vehicleInfo.Description = ko.computed(function () {
            return vehicleInfo.year() + ' ' + vehicleInfo.make() + ' ' + vehicleInfo.model();
        });             
    };
    // --- register custom ctor & initializer ---
    metadataStore.registerEntityTypeCtor(EntityNames.VehicleInfo, vehicleInfoCtor, vehicleInfoInitializer);
}