Question

我想获取这个孩子的钥匙，但是它返回null以及如何将{users_uid}存储到const或变量中？我不知道这是怎么了。

const uid_tugas = admin.database().ref('/user_course/{users_uid}/' + course_id);
             if (uid_tugas != null){
                uid_tugas.once('value').then(snap6 =>{
                    const uid_tugas_val = snap6.val();
                    console.log(`value uidnya`+ uid_tugas_val.course_id);

                }).catch(error =>{
                    console.log(error);
                })
             }
             else{
                console.log(`tidak ada`);
             }

数据库结构

这是我的全部功能代码

export const onNotifTugas = functions.database.ref('/tugas_course/{course_id}/{tugas_id}')
.onCreate((snapshot, context) =>{


    const course_id = context.params.course_id;
    const tugas_id = context.params.tugas_id;

    const authVar = context.auth;
    const timestamp = context.timestamp;
    const messageID = context.params.messageID;
    console.log(`MID ${messageID} in ${timestamp}`);


    return admin.database().ref('/tugas/' + tugas_id +'/').once('value').then(snap => {
            const tugasData = snap.val();
            const notifDataSend = { // buat structure data json dgn nama const notifDataSend untul cloud messaging
                data: {
                            data_type: "tugas",
                            title: "Anda mendapatkan notifikasi baru..", // data bebas (key, value)
                            body: `Tugas ${tugasData.nama_tugas} baru`, // chatId = const chatId
                            sound: "default"
                      }
             };

             const uid_tugas = admin.database().ref('/user_course/{users_uid}/' + course_id);
             if (uid_tugas != null){
                uid_tugas.once('value').then(snap6 =>{
                    const uid_tugas_val = snap6.val();
                    console.log(`value uidnya`+ uid_tugas_val.course_id);

                }).catch(error =>{
                    console.log(error);
                })
             }
             else{
                console.log(`tidak ada`);
             }




            return admin.messaging().sendToTopic(course_id, notifDataSend) 
            .then(function(response) {
                console.log("Successfully sent message:", response);
              })
            .catch(function(error) {
                console.log("Error sending message:", error);
              });

    }).catch(error => {
        console.log(error);
    })

Answer 1

假设authVar是您的身份验证参考，则您的uid将是authVar.uid。然后，您可以像这样编写uid_tugas作业：

const users_uid = authVar.uid;    
const uid_tugas = admin.database().ref('/user_course/' + users_uid + '/' + course_id)

您可以查看文档here。

获取值子返回空云函数实时数据库

1 个答案: