ko.observableArray()
プロパティで拡張されたエンティティのインポート中にエラーが発生[]
し、コンストラクターで単純な配列型として拡張されました。
var customerCtor = function () {
this.extendedProp = ko.observable(true);
//this.extendedArray = ko.observableArray(); // causes error: Cannot write a value to a ko.computed unless you specify a 'write' option. If you wish to read the current value, don't pass any parameters.
this.extendedArray = []; // this works just fine
};
Breeze v1.3.6 DocCode: exportImportTests.js "キャッシュ全体をローカルに隠して復元する" を出発点としてテストを作成しました。新しいテストは次のとおりです。
test("w/extended Customer, stash entire cache locally and restore", 3, function () {
var em1 = newEm();
var store = em1.metadataStore;
// extend Customer with observables
var customerCtor = function () {
this.extendedProp = ko.observable(true);
this.extendedArray = ko.observableArray(); // causes error: Cannot write a value to a ko.computed unless you specify a 'write' option. If you wish to read the current value, don't pass any parameters.
//this.extendedArray = []; // but this will work just fine?
};
store.registerEntityTypeCtor("Customer", customerCtor);
var expected = testData.primeTheCache(em1);
// grab first Customer, push value onto extendedArray prop
var custEntity = em1.getEntities(expected.customerType)[0];
custEntity.extendedArray().push('some-value'); // even when defined as [], Breeze re-writes field as ko.observable
var exportData = em1.exportEntities();
var stashName = "stash_everything";
window.localStorage.setItem(stashName, exportData);
var importData = window.localStorage.getItem(stashName);
var em2 = new EntityManager(); // virginal - so register ctor on this instance
var store2 = em2.metadataStore;
store2.registerEntityTypeCtor("Customer", customerCtor);
em2.importEntities(importData);
var entitiesInCache = em2.getEntities();
var restoreCount = entitiesInCache.length;
equal(restoreCount, expected.entityCount,
"should have restored expected number of all entities");
var restoredCustomer = em2.getEntities(expected.customerType)[0];
ok(restoredCustomer.extendedProp(), 'extended property present');
ok(restoredCustomer.extendedArray().length > 0, 'extended Array present and has data');
});
Anem2.importEntities(importData);
は次のエラーをスローします。
Error: Cannot write a value to a ko.computed unless you specify a 'write' option. If you wish to read the current value, don't pass any parameters.
at Error (<anonymous>)
at h [as extendedArray] (http://localhost:47595/Scripts/knockout-2.2.1.js:44:167)
at ctor.initializeEntityPrototype.proto.setProperty (http://localhost:47595/Scripts/breeze.debug.js:14634:31)
at updateTargetPropertyFromRaw (http://localhost:47595/Scripts/breeze.debug.js:13062:24)
at aspectName (http://localhost:47595/Scripts/breeze.debug.js:13025:13)
at Array.forEach (native)
at updateTargetFromRaw (http://localhost:47595/Scripts/breeze.debug.js:13023:19)
at em._inKeyFixup (http://localhost:47595/Scripts/breeze.debug.js:12601:17)
at Array.forEach (native)
at importEntityGroup (http://localhost:47595/Scripts/breeze.debug.js:12568:28)
Breeze は常にコンストラクタ フィールドを書き換えるため (私の場合は KO の場合)、as 定義は機能し[]
ます。しかし、プロパティが事前に定義されているのに、なぜこれが起こるのかわかりませんか?
誰かがこれに遭遇したか、どこかでドキュメントのメモを見逃したことがありますか?