Error 500 after submitting the form in codeigniter - php

Question

Using these MVC, I get Error 500. Any ideas?
Controller
<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
class Download extends CI_Controller {
function __construct()
{
parent::__construct();
parent::__construct();
$this->load->library('form_validation');
$this->load->database();
$this->load->helper('form');
$this->load->helper('url');
$this->load->model('upload_model');
//$this->output->enable_profiler(TRUE);
}
function index()
{
$this->form_validation->set_rules('enter_product_name',
'Enter Product Name',
'required|max_length[200]');
$this->form_validation->set_rules('test_type',
'Test Type',
'required|max_length[200]');
$this->form_validation->set_rules('test_unit',
'Test Unit',
'required|max_length[200]');
$this->form_validation->set_rules('project_code',
'Project Code',
'required|max_length[200]');
$this->form_validation->set_error_delimiters('<br /><span class="error">',
'</span>');
if ($this->form_validation->run() == FALSE) // validation hasn't been passed
{
$data->page = 'download_form_view';
$this->load->view('container', $data);
// $this->load->view('upload_form_view');
}
else // passed validation proceed to post success logic
{
// build array for the model
$file_name_info = $this->input->post('enter_product_name')
.'_'. $this->input->post('test_type')
.'_'. $this->input->post('test_unit')
.'_'. $this->input->post('project_code');
$filename_data = array(
'download_name' => $file_name_info
);
// run insert model to write data to db
if ($this->download_model->DownloadName($filename_data) == TRUE)
{
//redirect('download/download');
$this->download();
}
else
{
echo 'An error occurred while saving your filename to database. Please contact Admin with Issue No.[1]';
// Or whatever error handling is necessary
}
}
}
function download()
{
$this->load->helper('download');
$this->db->select('download_name');
$this->db->where("id", "0");
$this->db->limit(1);
$query = $this->db->get('downloadname');
$download_save_name = $query->row()->download_name;
$data = file_get_contents("./uploads/$download_save_name.xlsx");
force_download("$download_save_name.xlsx", $data);
}
}
?>
View
<?php // Change the css classes to suit your needs
$attributes = array('class' => '', 'id' => ''); echo
form_open('download', $attributes); ?>
<p>
<label for="enter_product_name">Enter Product Name <span class="required">*</span></label>
<?php echo form_error('enter_product_name'); ?>
<br /><input id="enter_product_name" type="text" name="enter_product_name" value="<?php echo
set_value('enter_product_name'); ?>" /> </p>
<p>
<label for="test_type">Test Type <span class="required">*</span></label>
<?php echo form_error('test_type'); ?>
<?php // Change the values in this array to populate your dropdown as required ?>
<?php $options = array(
'' => 'Please Select',
'LongTerm' => 'Long Term Study',
'ShortTerm' => 'Short Term Study',
'Experimental' => 'Experimental Study',
); ?>
<br /><?php echo form_dropdown('test_type', $options, set_value('test_type'))?> </p>
<p>
<label for="test_unit">Test Unit <span class="required">*</span></label>
<?php echo form_error('test_unit'); ?>
<?php // Change the values in this array to populate your dropdown as required ?>
<?php $options = array(
'' => 'Please Select',
'Hyd' => 'Hyd Unit',
'Viz1' => 'Viz Unit-1',
'Viz2' => 'Viz Unit-2',
); ?>
<br /><?php echo form_dropdown('test_unit', $options, set_value('test_unit'))?> </p>
<p>
<label for="project_code">Project Code <span class="required">*</span></label>
<?php echo form_error('project_code'); ?>
<br /><input id="project_code" type="text" name="project_code" value="<?php echo set_value('project_code'); ?>" /> </p>
<p>
<?php echo form_submit( 'submit', 'Submit'); ?> </p>
<?php echo form_close(); ?>
Model
<?php
class Download_model extends CI_Model {
function __construct() { parent::__construct(); }
function DownloadName($filename_data)
{
$this->db->update('downloadname', $filename_data, "id = 0");
if ($this->db->affected_rows() == '1') { return TRUE; }
return FALSE; } } ?>

Answer 1

I think the problem is:
you loaded
$this->load->model('upload_model');
and in your model code you have given
class Download_model extends CI_Model {
change this to
class Upload_model extends CI_Model {