如何在特定条件下触发通知？

Question

我在 firebase-messaging 中使用下面的云功能来通知用户 firestore 文档的更改，它工作正常，但我希望只有在特定条件下才触发通知达到

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;
          });

      }


      );

  });

我想要当作为数字的 value 变量是 hundered 的倍数时，才应触发通知。 我知道 value%100 == 0 检查数字是否是 hundered 的倍数的逻辑，但我不知道如何实现这个逻辑？ 请进一步指导我

Answer 1

希望这对您有所帮助！只需将发送通知代码放在 if 块和 else return null 或其他地方。

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;