AngularJS/Ionic promises - sometimes page loads forever - angularjs

Question

I am using promises in my controller, and most of the times it works well. But sometimes it just loads forever and the WordPress.getAllCategories() function does not even get called.
This is my controller:
var mod = angular.module('app.controllers.home', []);
mod.controller('HomeCtrl', function ($scope, $q, $sce, $ionicPlatform, WordPress, Loading) {
console.log('HomeCtrl init');
$scope.$on('$ionicView.enter', function () {
Loading.show();
WordPress.getAllCategories()
.then(function (cats) {
console.info(angular.toJson(cats));
console.info('cats ^');
$q.all(cats.data.map(function (cat) {
var d = $q.defer();
console.error(cat.name);
WordPress.getLatestPostOfCategory(cat.id)
.then(function (post) {
console.debug(post.data.title.rendered);
WordPress.getMediaById(post.data.featured_media)
.then(function (media) {
console.log(media.data.source_url);
cat.firstPost = {};
cat.firstPost.id = post.data.id;
cat.firstPost.title = post.data.title.rendered;
cat.firstPost.content = post.data.content.rendered;
if (cat.firstPost.title.length > 50) {
cat.firstPost.title = cat.firstPost.title + '...';
}
if (cat.firstPost.content.length > 70) {
cat.firstPost.content = cat.firstPost.content.substr(0, 60) + '...';
}
cat.firstPost.thumbnail = media.data.source_url;
d.resolve(cat);
}, function (err) {
console.error(angular.toJson(err));
});
});
return d.promise;
})).then(function (cats) {
console.log('Loaded all articles and for main page.');
$scope.homeCategories = cats;
Loading.hide();
});
});
});
});
Is there anything wrong in my controller?
P.S. I also debug all the WordPress service functions and they work just fine, and provide the needed data.
EDIT:
Sometimes when it loads forever, I see the console.error(cat.name); debug message only logs 3 messages. But still proceeds to the next function...

Answer 1

This is how I solved it, by Bergi's advice.
Source for help: Promise anti pattern by Gorgi Kosev (bluebird)
var categories = [];
function sort() {
return WordPress.getAllCategories()
.then(function (cats) {
console.log('thens');
return $q.all(cats.data.map(function (cat) {
console.info('cat: ' + cat.name);
var category = {};
category.name = cat.name;
return WordPress.getLatestPostOfCategory(cat.id)
.then(function (post) {
var post = post.data;
category.post = {};
category.post.id = post.id;
category.post.title = post.title.rendered;
category.post.content = post.content.rendered;
console.log('ID: ' + category.post.id + ', title: ' + category.post.title);
return WordPress.getMediaById(post.featured_media);
}).then(function (media) {
category.post.thumbnail = media.data.source_url;
categories.push(category);
console.log('Pushed category "' + category.name + '"');
});
}));
}, function (err) {
console.error('ERR1');
console.error(angular.toJson(err));
});
}
sort()
.then(function () {
console.info('LOADED ALL CATEGORIES');
$scope.categories = categories;
}, function (err) {
console.error('err:' + angular.toJson(err));
});