用户通知 - 如何恢复丢失notification_id从GCM？ [英] User Notifications - How to recover a lost notification_id from GCM?

问题描述

我生成 notification_key 取值所描述的>。

I generate notification_keys as described here.

假设由于一些错误我不能存储，所以我尝试重新注册。
这一次，我收到一个400错误的信息notification_key已存在。
这看起来很奇怪，尤其是相对于设备的登记到GCM 的，只要你想，你可以注册多次，一定可以得到与状态200
相同的注册ID 现在，我不能再注册，我也不能注销，因为我没有 notification_id 。

有没有什么办法让pviously产生 notification_key 从GCM的$ P $？
或者是与重新注册的唯一方法不同的 notification_key_name ？

Suppose that due to some error I fail to store it, so I try to re-register.
This time I receive a 400 error with the message "notification_key already exists".
This looks odd, especially compared to registration of a device to GCM, where you can register as many times as you want and always get the same Registration ID with status 200.
Now I can't register again, and I also can't unregister, because I don't have the notification_id.

Is there any way to get the previously generated notification_key from GCM?
Or is the only way to register again with a different notification_key_name?

推荐答案

根据该文档，没有办法从GCM的 notification_key 现有的<$得到C $ C> notification_key_name 。如果你想想看，这是有道理的，试图创建一个新的 notification_key 在现有的 notification_key_name 会给你一个错误，因为如果不是这样，你可能会意外地覆盖现有的 notification_key 如果你碰巧提供现有 notification_key_name的注册标识错误。

Based on the docs, there is no way to get from GCM the notification_key of an existing notification_key_name. If you think about it, it makes sense that trying to create a new notification_key for an existing notification_key_name would give you an error, since if it wasn't the case, you might be accidentally overwriting the Registration IDs of an existing notification_key if you happen to supply an existing notification_key_name by mistake.

正在比较这对登记设备GCM多次，每次都得到相同的注册ID，但它不是一个类似的情况。当您注册一个设备到GCM，GCM有办法识别设备，并知道它是已注册并返回相同的注册ID。随着用户的通知，它不仅具有 notification_key_name 你提供的，并没有什么使用相同的阻止你 notification_key_name 的多个用户。也就是说，有一些东西阻止你 - 试图创建一个 notification_key 以previously使用 notification_key_name 。

You are comparing this to registering a device to GCM multiple times, each time getting the same Registration ID, but it's not a similar situation. When you register a device to GCM, GCM has a way to identify the device and know that it is already registered and return the same Registration ID. With user notifications, it only has the notification_key_name that you supplied, and there's nothing stopping you from using the same notification_key_name for multiple users. That is, there is something stopping you - the error you got when trying to create a notification_key with a previously used notification_key_name.

这是简单的方法来解决你的问题是治疗 notification_key_name 由服务器生成的唯一标识符。如果你没有一个 notification_key 某个用户（可能是因为它是一个新的用户或者是因为你没有存储 notification_key 您$ P $从谷歌pviously了），你生成一个新的独特的 notification_key_name ，并用它来创建一个新的 notification_key 。你不必关心老 notification_key ，你没有商店。

An easy way to overcome your problem is to treat notification_key_name as a unique identifier generated by your server. If you don't have a notification_key for a certain user (either because it's a new user or because you failed to store the notification_key you previously got from Google), you generate a new unique notification_key_name and use it to create a new notification_key. You don't have to care about the old notification_key that you failed to store.

最后，你同时存储 notification_key 和 notification_key_name 中包含用户ID，表

Finally you store both the notification_key and notification_key_name in a table that contains the user id.

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