// if this isn't the top-level parent of the conversation, find it
if ($parent_item['gravity'] != Item::GRAVITY_PARENT) {
$toplevel_item = Post::selectFirst(Item::ITEM_FIELDLIST, ['id' => $parent_item['parent']]);
// if this isn't the top-level parent of the conversation, find it
if ($parent_item['gravity'] != Item::GRAVITY_PARENT) {
$toplevel_item = Post::selectFirst(Item::ITEM_FIELDLIST, ['id' => $parent_item['parent']]);