event.params.wildcard 返回错误的值

Question

我有一个非常简单的火力函数：

exports.sendFollowNotification = functions.database.ref('PendingRequest/{receiver_id}/{sender_id}').onWrite(requestEvent => {
    const requestSnapShot = requestEvent.data;
    const senderId = requestEvent.params.sender_id;
    const targetId = requestEvent.params.receiver_id;
    const target_token = requestSnapShot.child('sender').val();
    const sender_token = requestSnapShot.child('receiver').val();
    console.log('sender_id :'+senderId);
    console.log('target_id :'+targetId); 
    console.log('target_token: '+ target_token);
    console.log('sender_token: '+sender_token);
    const pendingRequestPayload = {
        data: {
            token_sender : sender_token,
            token_target : target_token,
            request_sender : senderId,
            request_receiver : targetId,                
            my_message_id: '0'
        }
    };
    if(target_token != null){   
     // Send a message to devices subscribed to the provided topic.
    return admin.messaging().sendToDevice(target_token, pendingRequestPayload)
        .then(function (response) {
            // See the MessagingTopicResponse reference documentation for the
            // contents of response.
            console.log("Successfully sent message:", response);
        })
        .catch(function (error) {
            console.log("Error sending message:", error);
        });
    }    

每当这个函数触发时，有两个值被交换：senderId 获取 targetId 值，反之亦然。这两个值都是使用 params 属性检索的，而我从 requestSnapShot.child('value_name'(.val(( 获得的值没有任何奇怪的变化;
愚蠢的解决方案只是在需要时交换这两个值，但是，这是一个非常愚蠢的解决方案。我在这里错过了什么？

Answer 1

如果"目标"是"接收器"，则交换这些：

const target_token = requestSnapShot.child('sender').val();
const sender_token = requestSnapShot.child('receiver').val();

您是否有意这样做以解决问题？

更新：

很难猜测为什么这对你不起作用。我复制了您的代码，消除了您的解决方法，并缩短了它以进行测试：

exports.sendFollowNotification = functions.database.ref('PendingRequest/{receiver_id}/{sender_id}')
       .onWrite(requestEvent => {
    const requestSnapShot = requestEvent.data;
    const senderId = requestEvent.params.sender_id;
    const targetId = requestEvent.params.receiver_id;
    const target_token = requestSnapShot.child('receiver').val();
    const sender_token = requestSnapShot.child('sender').val();
    console.log('sender_id :'+senderId);
    console.log('target_id :'+targetId);
    console.log('target_token: '+ target_token);
    console.log('sender_token: '+sender_token);
});

使用此数据运行：

{
  "PendingRequest" : {
    "R1" : {
      "S1" : {
        "receiver" : "R-token",
        "sender" : "S-token"
      }
    }
  }
}

并得到了这个日志输出：

sender_token: S-token
target_token: R-token
target_id :R1
sender_id :S1