laravel has one attach code example

Example 1: laravel eloquent associate

$account = App\Account::find(10);

$user->account()->associate($account);

$user->save();

Example 2: laravel attach

//id for single
$user->reasons->attach($reasonId);

//array for multiple
$user->reasons->attach($reasonIds);

$user->save();

Example 3: eloquent relationships

$roles = App\User::find(1)->roles()->orderBy('name')->get();