多对多为何获取不到插入的关联数据？

class Register extends Command
{
    use DispatchesJobs, DisplayUserTable;

    /**
     * The command name.
     *
     * @var string
     */
    protected $name = 'users:new';

    /**
     * The command description.
     *
     * @var string
     */
    protected $description = 'Create a new user.';

    /**
     * Handle the command.
     *
     * @param UserRepositoryInterface $users
     * @param RoleRepositoryInterface $roles
     */
    public function handle(UserRepositoryInterface $users, RoleRepositoryInterface $roles)
    {
        $data = collect();

        $data->put('visitant_id', 1);
        $data->put('visitant_value', 10);

        nikename:
        $data->put('nikename', $this->ask('Enter the desired nikename.', null));

        if ( $users->findByNikename($data->get('nikename')) instanceof UserInterface )
        {
            $this->error('The nickname you entered already exists.');
            goto nikename;
        }

        username:
        $data->put('username', $this->ask('Enter the desired username.', Str::random()));
        if ( $users->findByUsername($data->get('username')) instanceof UserInterface )
        {
            $this->error('The username you entered already exists.');
            goto username;
        }

        email:
        $data->put('email', $this->ask('Enter the desired email.', Str::random(6) . '@ofcold.com'));
        if ( ! filter_var($data->get('email'), FILTER_VALIDATE_EMAIL) )
        {
            $this->error('Please enter correct email.');
            goto email;
        }
        if ( $users->findByEmail($data->get('email')) instanceof UserInterface )
        {
            $this->error('The email you entered already exists.');
            goto email;
        }

        mobile_phone:
        $data->put('mobile_phone', $this->ask('Enter the desired mobile phone.', null));
        if ( ! preg_match('/^1(?:3[0-9]|4[5-9]|5[0-9]|66|7[014-8]|8[0-9]|9[89]|99)\d{8}$/', $data->get('mobile_phone')) )
        {
            $this->error('Please enter correct mobil phone.');
            goto mobile_phone;
        }
        if ( $users->findByMobilePhone($data->get('mobile_phone')) instanceof UserInterface )
        {
            $this->error('The mobile phone you entered already exists.');
            goto mobile_phone;
        }

        $data->put('password', $this->ask('Enter the desired password.', Str::random(15)));

        $data->put('enabled', $this->ask('Do you want to enable this user?', true));

        $rolesCollection = $roles->all()->map(function($role) {
            return $role->getSlug();
        })->toArray();

        role:
        $role = $this->askWithCompletion(
            'What role do you want to use for this user? [' . implode(',', $rolesCollection) . ']',
            $rolesCollection,
            'user'
        );

        if ( ! in_array($role, $rolesCollection, true) )
        {
            $this->error('Please select the correct user role.');
            goto role;
        }

        $user = $users->create($data->toArray());

        if ( $role = $this->dispatch(new GetRole($role)) )
        {
            $user->attachRole($role);
        }

        $this->alert('You have successfully created a user.');

        // 这里获取刚插入用户的数据，可是拿不到角色的数据。
        $this->table($this->headers, [$this->getUserRow($user)]);

    }

}