Login with Ion Auth both Username and Email
You have first goto ion_auth_model and search login function in ion_auth_model and you will see this line.
$query = $this->db->select($this->identity_column .", ".$extraSelect.', email, id, password,active, last_login')Add username into this line
$query = $this->db->select($this->identity_column .", ".$extraSelect.', username, email, id, password,active, last_login')After this add or_where() clause
->where($this->identity_column, $identity)->or_where('username',$identity)->limit(1)->order_by('id', 'desc')->get($this->tables['users']);