在Firebase中结合使用onDisconnect和云功能 [英] Combine onDisconnect with Cloud Functions in Firebase

问题描述

假设用户可以写入房间"，并且当用户断开连接时应该删除这些值，我认为云功能代码应如下所示:

Let's say a user can write to "rooms" and the values should remove when the user disconnects, I thought the cloud function code would look like this:

exports.Rooms = functions.database.ref('/rooms/{values}').onWrite(event => {
 if (!event.data.exists()){return}
   return db.ref('rooms/' + `${event.params.values}`).onDisconnect().remove()
}
})

但是，当用户在将值写入房间"后断开连接时，什么也没有发生.当用户断开连接时，如何删除写入的路径?

But when the user disconnects after he wrote values to 'rooms', nothing happens. How can I remove the path written to when the user disconnects?

谢谢.

推荐答案

onDisconnect()在Cloud Functions中无法使用.在客户端这很有意义，因为客户端是断开连接的事情.如果要让功能在客户端断开连接时触发，则必须在客户端上设置onDisconnect()，将内容写入触发该功能以对该事件做出反应的位置.

onDisconnect() doesn't make sense to use from Cloud Functions. It makes sense on the client side, since the client is the thing doing the disconnecting. If you want a function to trigger when the client disconnects, you'll have to set up the onDisconnect() on the client side, the have that write to a location that triggers a function to react to that event.

这篇关于在Firebase中结合使用onDisconnect和云功能的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！