并发/待办事项示例不起作用

问题描述

我正在尝试执行ToDo示例，并在尝试并发处理时遇到未处理的说明。

I was trying out the ToDo sample and ran into an unhandled Excaption while trying out the Concurrency Handling.

dataservice.js在<$ c $中包含这些行c> saveFailed（error）方法：

The dataservice.js contains these lines in saveFailed(error) method:

if (detail && detail.ExceptionType.indexOf('OptimisticConcurrencyException') !== -1) {
        // Concurrency error
        reason =
            "Another user, perhaps the server, may have deleted one or all of the todos.";
        manager.rejectChanges(); // DEMO ONLY: discard all pending changes
    }

客户端永远不会达到这一点由于以下原因导致未处理的OptimisticConcurrencyException：

The client never gets to this point due to an unhandled OptimisticConcurrencyException in:

[HttpPost]
    public SaveResult SaveChanges(JObject saveBundle) {
        return _contextProvider.SaveChanges(saveBundle);
    }

我试图抓住这一点并返回异常，这是一个愚蠢的异常不是 SaveResult 类型。这是错误还是我在某处缺少配置？

I was trying to catch this and return the Exception which was kind of stupid as the Exception is not of type SaveResult. Is this a bug or am i missing an configuration somewhere?

Greets

推荐答案

任何服务器端错误都应返回给promise.fail处理程序。例如

Any server side errors should be returned to the promise.fail handler. i.e.

em.saveChanges().then(function(saveResult) {
   // normal path

}).fail(function(error) {
   // your concurrency exception message will be part of the error object.
});

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