如何在特定条件下触发通知

Question

我在firebase消息中使用云下功能来通知用户firestore文档中的更改，该文档运行良好，但我希望只有在达到特定条件时才触发通知

exports.sendNotification2 = functions.firestore.document("users/{to_user_id}/notifications_received/{notification_id}").onWrite((change, context)=>{
      const to_user_id = context.params.to_user_id;
      const notification_id = context.params.notification_id;
      const to_token_id = context.params.to_token_id;

      return admin.firestore().collection('users').doc(to_user_id).collection('notifications_received').doc(notification_id).get().then(queryResult=>{
          const from_user_id = queryResult.data().from_user_id;
          const to_token_id = queryResult.data().to_token_id;
          const to_user_id = queryResult.data().to_user_id;
          const notificaionmessage = queryResult.data().notification_message;
         
          const notification_id = queryResult.data().notification_id;
const value = queryResult.data().value;
          const payload = {
              notification : {
                  title: notificaionmessage,
                  body: notificaionmessage,
                  icon:"default"
                              },
                              data: {
                                       click_action: 'FLUTTER_NOTIFICATION_CLICK2',
                                       notification_id: notification_id,
                                       category: 'default'
                                     }
          };

         return admin.messaging().sendToDevice(to_token_id,payload).then(result=>{
              console.log("Notification Sent Successfulllllllllllll");
              return null;
          });
      }

      );
  });

我希望当value变量是一个数字，是无序的倍数时，只有这样才应该触发通知。我知道value%100 == 0的逻辑来检查数字是否是无序的倍数，但我不知道如何实现这个逻辑？请指导我进一步

Answer 1

希望这会有所帮助！只需将发送通知代码放在if块中，并在else中返回null或其他内容。

if (value%100 === 0){
const payload = {
notification : {
title: notificaionmessage,
body: notificaionmessage,
icon:"default"
},
data: {
click_action: 'FLUTTER_NOTIFICATION_CLICK2',
notification_id: notification_id,
category: 'default'
}
};

return admin.messaging().sendToDevice(to_token_id,payload).then(result=>{
console.log("Notification Sent Successfulllllllllllll");
return null;
});
}//end if block
else return null;