Eloquent: filter only rows which has related "children" rows

Simple use-case: you want to filter only those categories which have at least one product. Or course, you write Category::with('products')->... but how do you filter out those empty categories? Those with no product? There's an app function for that: has(). Let's show the full code. app\Category.php:
class Category extends Model {

    // ...

    public function products() {
        return $this->hasMany('App\Product');
    }

    // ...

}
app\Http\Controller\CategoriesController.php:
function getIndex() {
    $categories = Category::with('products')->has('products')->get();
    return view('categories.index', compact('categories'));
}
So, as you can see, it's a simple filter-function ->has('products') - it will filter out the categories without products.

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