Controllers must have an index() function?

[eluser]Ryuuzaki92[/eluser]
from the user quide:

Note: All values are escaped automatically producing safer queries.

normally you would read the return data and show a 404 page if the record does not exist.

Code:

$user = $this->user->get_by_username($username);

if (!$user->id) {
  show_404();
}