public function show(UserAuth $user, $uid, $sid)
{
return $user->sells()->with(['product' => function ($q) {
$q->select('id', 'title');
}, 'seller' => function ($q) {
$q->select('id', 'username');
}, 'buyer' => function ($q) {
$q->select('id', 'username');
}])->find($sid) ?: $this->notFoundJson();
}
