/**
* A validation callback for making sure usernames aren't re-used
* @param string $email
* @return bool
*/
public function username_check($username)
{
$this->load->model('contributor');
$this->load->library('form_validation');
if (!Contributor::findByUsername($username)) {
return true;
}
$this->form_validation->set_message('username_check', 'This username has already been used');
return FALSE;
}
