CODEWITHSUNDEEP
node.jsfirebasefirebase-realtime-databasegoogle-cloud-platformgoogle-cloud-functions
ogulcan
ogulcan

Reputation: 53

Use other references value from firebase realtime trigger functions

Hi I started add some backend logic to my android app using firebase functions I want to use some value different then event data value 

exports.makeUppercase = functions.database.ref('path')
     .onWrite(event => {
      const original = event.data.val();
      //I want to use value like this.
      const other_val= root.database.ref('path').val();
      console.log('email', "firms", original);
      const uppercase = original.toUpperCase();
      return event.data.ref.parent.child('uppercase').set(uppercase);
    });

I want to use other_valwith event data but so far I just using event data ref but I can ascend or descend in database event.data.ref using more parent or child. How can I solve it?

Edit: I try and learn correct way to do this thanks to @davidtaubmann for his answer.

exports.makeUppercase = functions.database.ref('/nonVerifiedUsers/{email}')
     .onWrite(event => {

      var changed= "";
      // You can use ref parameter like this
      var param=event.params.email;
      admin.database().ref('/uppercase').once('value').then(function(snap){
      changed=snap.val();
          }).then(function(){
              /*if you want to use changed value wait until it return and return where 
              you want using admin.database.ref and use event parameter in reference like 
              this*/
              return admin.database.ref('/path/').child(param).set(changed);
              /*You can return regular event data but make sure you didn't write under 
              same reference server count this again as event and loop until reach 32 th child(maxiumum child nodes)*/
              return event.data.ref.parent.child('uppercase').set(changed);
          });
       //In addition you can return multiple times in one function:
        return event.data.ref.parent.child('dif').set(changed);

      
      });

Upvotes: 2

Views: 4416

Answers (1)

DavidTaubmann
DavidTaubmann

Reputation: 3360

use firebase-admin node_module

Following my comments above, I did tested the options and as thought, if you initialize the Firebase-admin from node_modules (be sure it is also included in packages.json) you can retrieve any data from the database.

For your code I believe you only have to add this 2 lines at the beginning of the index.js file (with all the other initializations):

const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);

then you can later use the admin as you would commonly use firebase, like this:

admin.database().ref('users/xxxx').once('value').then(function(snapshot){....

It just works perfectly for me!

Upvotes: 4

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