云功能推送通知问题

Posted 2023-02-23

【中文标题】云功能推送通知问题

【英文标题】：Problem with cloud function push notification

【发布时间】：2021-01-02 20:22:49

【问题描述】：

在我的 Flutter Firebase 应用程序中，我正在尝试配置推送通知，但我发现它非常具有挑战性，因为我对 javascript 非常陌生。下面的代码，我正在尝试根据用户活动项字段（评论）发送通知。如果活动项的评论字段为空，则表示该活动项的帖子正在被点赞，如果不为空，则表示该活动项的帖子正在被评论。大多数代码的工作原理是获取用户设备令牌、保存它，甚至是数据的控制台登录快照并将消息发送到设备。但问题是当云功能触发并将消息发送到用户设备时，消息正文似乎为空，我得到提示我没有在活动项的正确值上编写 switch 语句（评论）。几个月来我一直在审查这个，谢谢

//This part of the cloud function code to listens to new document on
// the activity path  
exports.onCreateActivityNotification = functions.firestore
.document('/activities/userId/userActivities/userActivitiesId')
 .onCreate(async (snapshot, context) => 
 console.log('activity notification created', snapshot.data());
 //getting user connected to the activity
 const userId = context.params.userId;
 const createdActivityItem = snapshot.data();
 const usersRef = admin.firestore().doc(`users/$userId`);
 const doc = await usersRef.get();
 const androidNotificationToken = 
 doc.data().androidNotificationToken;
  //checks if user has an androidnotification token
 if(androidNotificationToken)
 //sennds notification if users has a token
   sendNotification(androidNotificationToken, createdActivityItem )
   else 
   console.log('no notification token');
  
   //function for sending the notification, I am very sure my problem is coming from this 
    //part of the code. I am not writing the switch statement on the right value. I think I 
    //need to get the exact fields of the activity item
 function sendNotification(androidNotificationToken, userActivities)
  
  let body;
     switch (userActivities)
      case userActivities.comment !== null:
        body = `$userActivities.fromUserId commented  : 
      $userActivities.comment`
        break;
        case userActivities.comment === null:
        body = `$userActivities.fromUserId liked your punch`
        break;
        default: 
         break;
        
     //creates message for push notification
    const message = 
    notification: body: body,
    token: androidNotificationToken,
    data: recipient: userId,
    ;
    //sends message with admin.messaging()
    admin
   .messaging()
   .send(message)
   .then(response => 
   return console.log('message sent', response);
    ).catch(error =>
    console.log('error sending message', error);
   )
 

);

       // This is the code to create the activity item for which triggers the cloud function
        // just for reference
      static void addActivityItem(
      String currentUserId, Post post, String comment) 
      if (currentUserId != post.authorId) 
        activitiesRef.document(post.authorId).collection('userActivities').add(
         'fromUserId': currentUserId,
          'postId': post.id,
          'seen': '',
           'postImageUrl': post.imageUrl,
          'comment': comment,
        'timestamp': Timestamp.fromDate(DateTime.now()),
       );

【参考方案1】：

尝试像这样更改您的开关：

 switch (userActivities.comment)
      case null:
      body = `$userActivities.fromUserId commented  : $userActivities.comment`
      break;
     
      default: body = `$userActivities.fromUserId liked your punch`

      

或考虑使用if else

【讨论】：

非常感谢。它工作得很好。当我更改 switch 语句时