In my current project, I am trying to ensure that a promise resolves after making a query on Firebase. The goal is to retrieve specific keys from one table and then iterate through another table to fetch the desired artwork.
artistFactory.js
'use strict';
angular.module('artvoicesApp')
.factory('Artist', function(localStorageService, FIREBASE_URL, $q) {
var artistData = {};
var userKey = localStorageService.get('userKey');
var accountKey = localStorageService.get('accountKey');
var artistRef = FIREBASE_URL.child('v2/artist');
var accountRef = FIREBASE_URL.child('v2/account/' + accountKey);
var userRef = FIREBASE_URL.child('v2/user/' + userKey);
artistData.addArtist = function(artistName) {
var artist = artistRef.push();
accountRef.child('artists/' + artist.key()).set(true);
userRef.child('artists/' + artist.key()).set(true);
artist.set({name: artistName});
artist.child('users/' + userKey).set(true);
artist.child('accounts/' + accountKey).set(true);
};
artistData.getArtistKeys = function() {
var artistKeys = [];
var defer = $q.defer();
accountRef.child('artists').once('value', function(snapshot) {
snapshot.forEach(function(childSnapShot) {
artistKeys.push(childSnapShot.key());
});
defer.resolve(artistKeys);
});
return defer.promise;
};
artistData.getArtists = function(artistKeys) {
var artistObj = {};
var artistRef = FIREBASE_URL.child('v2/artist');
var defer = $q.defer();
artistKeys.forEach(function(artist) {
artistRef.child(artist).once('value', function(snapshot) {
artistObj[artist] = snapshot.val();
});
defer.resolve(artistObj);
});
return defer.promise;
};
return artistData;
});
artwork.controller.js
Artist.getArtistKeys().then(function(artistKeys) {
Artist.getArtists(artistKeys).then(function(artists) {
vm.artists = artists;
console.log(vm.artists);
});
});
If I assign vm.artwork with a timeout, it returns the correct data.