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[eluser]Michael Wales[/eluser]
This is how I go about it - by placing a class variable within the model to store the last used ID.

Code:

class Post extends Model {
  var $last_id

  function save($post = array()) {
    if (count($post) > 0) {
      $this->db->insert('posts', $post);
      if ($this->db->affected_rows() == 1) {
        $this->last_id = $this->db->insert_id();
        return TRUE;
      }
    }
    return FALSE;
  }
}

Code:

class Greeting extends Controller {
  function index() {
    // Load the form validation library and handle your rules
    if ($this->form_validation->run()) {
      $post = array('title' => $this->input->post('title'),
        'body' => $this->input->post('body'));
      if ($this->post->save($post)) {
        // Our model will populate the class variable if a post was saved
        // We can redirect to a method that will display that post
        redirect('view/' . $this->post->last_id);
      }
    }

    // The form wasn't processed - display it
    $this->load->view('edit');
  }
}