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.