统计Firebase云消息传递中的主题订阅者数量 [英] Count subscribers of a topic in Firebase Cloud Messaging

问题描述

我想对我的应用程序做什么：用户可以选择不同的兴趣，只要有超过5人对同一件事感兴趣，我想给他们发一个通知。
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我认为Firebase +主题是一个不错的选择。

但是我怎样才能知道有多少人订阅了一个主题？

解决方案没有可用的API来检查一个主题有多少订阅者。 （请参阅我的答案此处）

您必须在服务器端实现映射，保存主题名称并添加到订阅者列表中。订阅后，添加新的订阅者，检查计数（看看是否在您的首选号码），然后触发通知。

What I want to do with my app is this: users can select different interests and as soon as there are more than ~5 people interested in the same thing, I want to send them a notification.

I thought Firebase + Topics would be a good choice for this.

But how do I find out how many people have subscribed to a topic?

解决方案

There is no available API to check how many subscribers a topic has. (see my answer here)

You'll have to implement the mapping on your server-side, saving the name of the topics and adding in the list of subscribers. Upon subscription, add the new subscriber, check the count (see if it's within your preferred number), then trigger a notification.

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