*/ public function author(): BelongsTo { return $this->belongsTo(Author::class); } } class Author extends Model {} assertType('Spatie\QueryBuilder\QueryBuilder', QueryBuilder::for(Book::class)); assertType('Spatie\QueryBuilder\QueryBuilder', QueryBuilder::for(Book::query())); assertType('Spatie\QueryBuilder\QueryBuilder', QueryBuilder::for((new Book)->author()));