undefined variable Codeigniter and invalid argument supplied foreach read database - php

Question

I was following the instruction to get the entire record from table, and load them into html table. this is the model
private $namatabel;
public function __construct() {
parent::__construct();
$namatabel='ms_kategori_material';
}
function read()
{
$sql = $this->db->get($this->namatabel);
if($sql->num_rows() > 0)
{
foreach($sql->result() as $row)
{
$data[] = $row;
}
return $data;
}
else
{
return null;
}
}
then use the read() function on controller
public function __construct() {
parent::__construct();
$this->load->model('m_kategorimaterial');
}
function index()
{
$data['c_row'] = $this->m_kategorimaterial->read();
//pass the c_row into the views
$this->load->view('v/vkategorimaterial', $data);
}
to display them on the views
<?php
$no = 1;
foreach ($c_row as $row) { ?>
<tr id="row">
<td id="no"><?php echo $no;?></td>
<td id="judul"><?php echo $row->Kode_Kategori_Material_Jasa;?></td>
<td id="kategori"><?php echo $row->Nama_Material_Jasa;?></td>
</tr>
<?php
$no++;
}
?>
but then I got an error saying, undefined variable c_row and invalid argument supplied foreach(). I thought I have sent the c_row variable through the c_kategorimaterial/index and copy pasting foreach statement. what went wrong ?

Answer 1

1)Check whether you are getting the data right by using print_r($data). If that went wrong,you are probably missing something in the query.
2)If you got the db data perfectly,then just change the name of returning array in your model.
function read()
{
$sql = $this->db->get('ms_kategori_material');
if($sql->num_rows() > 0)
{
foreach($sql->result() as $row)
{
$c_row[] = $row;
}
return $c_row; //comment this return part while debugging
// print_r($c_row);
//exit;
}
else
{
return null;
}
}

Answer 2

It would be better if you print your data array to get exact idea of what you are getting in that array. Try following format, might be helpful
function getPosts() {
$query = $this->db->get('posts');
$posts = array();
foreach ($query->result() as $row) {
$posts[] = array(
'id' => $row->id,
'title' => $row->title,
'content' => $row->content
);
}
return $posts;
}