Row detail

Override rowDetail() to make a row expandable. Each expandable row gets a chevron that folds a detail panel open beneath it. The detail is a Fragment loaded over AJAX when the row opens — nothing is fetched for collapsed rows — so the detail can be as rich as you like without weighing down the table payload.

use Lattice\Fragments\Components\Fragment;

public function rowDetail(array $row): ?Fragment
{
    return Fragment::lazy(OrderLinesFragment::class, ['orderId' => $row['id']]);
}

Return null for rows that should not expand — those rows simply show no chevron.

The detail fragment

The detail lives in its own #[AsFragment] class, authored and tested independently of the table. It reads the row context you passed to Fragment::lazy():

use Lattice\Core\Attributes\AsFragment;
use Lattice\Core\PageSchema;
use Lattice\Fragments\FragmentDefinition;

#[AsFragment('order-lines')]
final class OrderLinesFragment extends FragmentDefinition
{
    public function schema(PageSchema $schema): PageSchema
    {
        $order = Order::with('lines')->findOrFail($this->context('orderId'));

        return $schema->component(/* … the order's lines … */);
    }
}

Because it is a real fragment, the detail inherits the whole Fragment pipeline: a signed per-row endpoint, authorization, the loading skeleton, and per-fragment reload events.

Behavior

The chevron toggles the row; the rest of the row stays free for row actions and links.
Several rows can be open at once.
Expansion is client-side and resets when the table reloads, re-sorts, re-filters, or paginates; the detail re-fetches each time a row opens.