CODEWITHSUNDEEP
angularjsionic-frameworkfirebasefirebase-realtime-database
dms
dms

Reputation: 35

Retrieving children from children in firebase with Ionic

I'm trying to retrieve the posts from all the users in Ionic(without having the specific user id). I can get all the posts from the first user in the database, but am having trouble with getting the posts from the other users.

This is a simplified version of my firebase structure:

"posts_meta" : {

   "uid" : {

     "post-id" : {
        "title": "",
        "content": ""
     },
   },

   "uid" : {

     "post-id" : {
        "title": "",
        "content": ""
     },
     "post-id" : {
        "title": "",
        "content": ""
     },
   }

And here I'm trying to loop through the users first and then loop through the posts for each user by using a nested foreach:

.factory('Timeline', function($q, Profile, Utils, Codes) {

var self = this;

self.getAllPosts = function() {
    var qGet = $q.defer();
    var ref = new Firebase(FBURL);

    ref.child("posts_meta").once("value", function(snapshot) {

        snapshot.forEach(function(childSnapshot) {

            childSnapshot.forEach(function(grandchildSnapshot) {
                qGet.resolve(grandchildSnapshot.val());
            })
        })
}, function (error) {
        Codes.handleError(error);
        qGet.reject(error);
    });
    return qGet.promise;
};

What am I doing wrong? Am I missing something?

Upvotes: 0

Views: 795

Answers (1)

Italo Ayres
Italo Ayres

Reputation: 2663

You can't call multiple resolves for a single promise. The promise is being resolved in the first loop iteration and then the others are being ignored.

You can try save all granchilds to an array, but I believe firebase has its ways to solve this with a better performance.

    var values = [];

    snapshot.forEach(function(childSnapshot) {

        childSnapshot.forEach(function(grandchildSnapshot) {
            values.push(grandchildSnapshot);

        })
     })
     promise.resolve(values)

Upvotes: 1

Related Questions