How to get average with orderBy Desc in Laravel 5

Question

I have 2 tables in my database.

books and ratings

in books id, name

in ratings

Answer 1

You can use a modified withCount():

$books = Book::withCount(['ratings as average_rating' => function($query) {
    $query->select(DB::raw('coalesce(avg(rating),0)'));
}])->orderByDesc('average_rating')->get();