How to access deep value of realtime db with cloud function? - firebase

Question

In childSnapshot.val().k I have this with cloud function:
{ '-LdmZIlKZh3O9cR8MOBU':
{ id: 'ceccomcpmoepincin3ipwc',
k: 'test',
p: 'somepath',
t: 1556700282278,
u: 'username' },
'-Llkocp3ojmrpemcpo3mc':
{ id: '[epc[3pc[3m,',
k: 'test2',
p: 'somepath2',
t: 1556700292290,
u: 'username2' }
}
I need each path value so I can delete that file from storage. How to access this value?
My cloud function for refreshing states, removing and deleting files from storage:
var db = admin.database();
var ref = db.ref('someref');
ref.once("value").then((snapshot) => {
var updates = {};
var patObject = {
fid: null,
ft: null,
ftr: null,
fu: null,
id: null,
lid: null,
lt: null,
ltr: null,
lu: null,
t: null,
tr: null,
v: null,
g: null,
l: null,
k: null
};
snapshot.forEach((childSnapshot) => {
if(childSnapshot.numChildren() >= 14){
var t = childSnapshot.val().t;
if((t===1 || t===5) && childSnapshot.val().tr > 0) {
if(childSnapshot.val().tr - 12 > 0){
updates[childSnapshot.key + '/tr'] = childSnapshot.val().tr - 12;
if(childSnapshot.val().k !== ""){
console.log('path: ', childSnapshot.val().k);
childSnapshot.val().k.snapshot.forEach(kpath => {
console.log('path: ', "path");
});
}
} else {
updates[childSnapshot.key] = patObject;
}
}
if(childSnapshot.val().tr<=0){
updates[childSnapshot.key] = patObject;
}
} else {
updates[childSnapshot.key] = patObject;
}
});
ref.update(updates);
res.send("");
return "";
}).catch(reason => {
res.send(reason);
})
return "";

Answer 1

If you want to delete all the files corresponding to the values of the ps, you need to use Promise.all() to execute in parallel the asynchronous deletion tasks (Since the delete() method returns a Promise). You need to iterate over the object that contains the p paths.
It is not easy to understand your code, so you'll find below the part corresponding to the above explanations. It's up to you to integrate it in your code!
const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp();
const defaultStorage = admin.storage(); //Note this line
//.....
exports.date = functions.https.onRequest((req, res) => { //I understand that you use an HTTP Cloud Function
//....
.then(...
// Somehow you get the object you mention in your question, through childSnapshot.val().k
const kObject = childSnapshot.val().k;
const bucket = defaultStorage.bucket(yourFileBucket);
const promises = [];
Object.keys(kObject).forEach(
//The values of the path p are obtained via kObject[key].p
//Based on that we push the Promise returned by delete() to the promises array
promises.push(bucket.file(kObject[key].p).delete());
);
return Promise.all(promises)
.then(results => {
//Here all the Promises that were in the promises array are resolved, which means that all the files are deleted
res.send({result: results.length + ' files(s) deleted'});
})
.catch(error => {
res.status(500).send(error);
});
});
Watch may be interested by watching the following official Firebase video by Doug Stevenson: https://youtu.be/7IkUgCLr5oA