displaying a flash message after redirect

Question

I'm programming an EE extension, and in the save_settings() method, if I redirect() (after unsuccessful data validation), the message stored in the set_flashdata() method doesn't show. If I comment the redirect and let the method put the user back in the main extensions page, then the flashdata shows up fine. It's only if I redirect that the data isn't shown.

This is my save settings method - as near as I can tell I'm not doing anything out of the ordinary - it's mostly boilerplate as near as I can tell. I'd be very appreciative of anybody that can shed light on this...

function save_settings(){

    // no unauthorized access
    if (empty($_POST)) {
        show_error($this->EE->lang->line('unauthorized_access'));
    }

    // get the routestring then convert it to an array
    $routestring = $this->EE->security->xss_clean($this->EE->input->post('routes'));
    $results = $this->routes_to_array($routestring);

    // if the conversion was ok:
    if ($results['status'] == 'success') {

        // update db
        $this->EE->db->where('class', __CLASS__);
        $this->EE->db->update('extensions', array('settings' => serialize(array('routes' => $results['results']))));

        // set flash data
        $this->EE->session->set_flashdata('message_success', "Routes updated.");

    // if something went wrong during conversion:  
    } else {

        // set flash data then redirect back to edit screen
        $this->EE->session->set_flashdata('message_failure', $results['message']);

        // IF I COMMENT THE FOLLOWING LINE, THE FLASH DATA SHOWS UP FINE
        $this->EE->functions->redirect(BASE.AMP.'C=addons_extensions'.AMP.'M=extension_settings'.AMP.'file=apsdsm_bossyboots');
    }              
}

OK, this is my view file - as far as I can tell this is as boiler plate as it gets. More boiler plate than a dish that's been held in scalding water for ten minutes.

<?php echo form_open('C=addons_extensions'.AMP.'M=save_extension_settings'.AMP.'file=apsdsm_bossyboots'); ?>

<table class="mainTable" border="0"cellspacing="0" cellpadding="0">
    <thead>
        <tr>
            <th>
                Routes
            </th>
        </tr>
    </thead>

    <tbody>

        <tr>
            <td>

                <?php echo form_textarea(array('name'=>'routes', 'value' => $routestring)) ?>

                <?php echo form_submit('submit', 'Update Routes', 'class="submit"') ?>
            </td>
        </tr>
    </tbody>
</table>

<?php echo form_close()?>

Answer 1

I'm not positive if this will work or not, but the CodeIgniter Session library has a method for keeping flashdata for more more request, I'd imagine this would help here.

Try adding this before the redirect: $this->EE->session->keep_flashdata('message_failure');