Show latest blog posts on custom page template - php

Question

I need some help converting this code from SS3 to SS4.
I used the code below to pull my latest blog posts through to my custom homepage template. This no longer works for me in SS4. Not sure how what needs to be added to fix it.
class IndexPageController extends PageController {
public function LatestPostsHome()
{
return BlogCategory::get()
->filter('Title', 'Featured')
->relation('BlogPosts')
->sort('PublishDate', 'DESC');
}
}
Thank,

Answer 1

Do you have several BlogCategories with the same title?
If you only have one BlogCategory with title 'Featured' then this should work:
public function LatestPostsHome()
{
$blogCategory = BlogCategory::get()->filter('Title', 'Featured')->first();
if (!$blogCategory) {
return null;
}
// Get the corresponding has_many/many_many objects.
$blogPosts = $blogCategory->BlogPosts()->sort('PublishDate', 'DESC');
return $blogPosts;
}
If you have multiple categories with the same title, then you can maybe use something like this:
public function LatestPostsHome()
{
$blogCategories = BlogCategory::get()->filter('Title', 'Featured');
if (!$blogCategories->exists()) {
return null;
}
// Option 1 (not tested)
$categoryIDs = $blogCategories->column('ID');
$blogPosts = BlogPost::get()->byIDs($categoryIDs);
return $blogPosts;
// Option 2 (not tested)
$blogPosts = new \SilverStripe\ORM\ArrayList();
foreach ($blogCategories as $category) {
$posts = $category->BlogPosts();
$blogPosts->push($posts->toNestedArray());
}
return $blogPosts;
}