Load Count on-the-fly

In addition to Eloquent's withCount() method to count related records, you can also load the count on-the-fly, with loadCount():

// if your Book hasMany Reviews...
$book = Book::first();
 
$book->loadCount('reviews');
// Then you get access to $book->reviews_count;
 
// Or even with extra condition
$book->loadCount(['reviews' => function ($query) {
    $query->where('rating', 5);
}]);