php codeigniter foreach loop for viewing page - php

Question

So I'm working on this/these problem(s), and there's just a lot going on for recently using codeigniter..
So, I have these specific tables:
sect_tbl ----------- sub_tbl
sect_id ----------- sub_code
2 --------------------ST20
3 --------------------AS13
3 --------------------DA11
1 --------------------PE40
2 --------------------SE10
3 --------------------PE20
4 --------------------RT40
I made sect_id the foreign key in sub_tbl.
the display - a side menu:
link of sect_ids:
1
2
3
4
I want to make it so, that if I click the link of sect_id 3, I'll be redirected to a new page with its corresponding set of sub_code -- "AS13, DA11, PE20" as seen in the table above.
Expected outcome is something like this:
sub_code
(in sect_id-3)
| AS13 |
| DA11 |
| PE20 |
Model: (most definitely not right )
function fetch_view($data){
$query = $this->db->query("SELECT a.sub_code, a.sub_name, a.sect_id,
b.block_name, b.year_level FROM subject as a JOIN section as b
WHERE a.sect_id = b.sect_id ");
return $query->result();
}
Controller:
$data["subjects"] = $this->view_model->fetch_view($this->session-
userdata('user_id'));
view: (this lacking since I cant get around much further with foreach loop yet )
<?php
foreach ($subjects as $row) {
?>
<?php echo $row->year_level.$row->block_name; ?>
<?php
}
?>
-> I tried working my way with href to redirect me and then be able to view it dynamically but it backfired. Thanks a lot to those who could spare their time to share solutions.

Answer 1

If you say you want all sub codes where sect ID = 3
$sect_id = 3;
I simplified your query, but the main problem was that you had no use of "on x = y" for your join
$query = $this->db->query("
SELECT
sec.year_level,
sec.block_name,
sub.sub_code,
FROM section as sec
JOIN subject as sub
ON sec.sect_id = sub.sect_id
WHERE sec.sect_id = ?
", [ $sect_id ] );
if( $query->num_rows() > 0 )
return $query->result();
return [];
Then, because I don't have your actual table schemas, I couldn't suggest if your view is correct, but in general, something like this should work:
$this->load->helper('url');
foreach( $subjects as $row )
{
echo anchor( 'subs/show/' . $row->sub_code, $row->year_level . $row->block_name );
}
Also, as a side note, try to always follow a code style with proper indentation. It makes things that are wrong stand out and easier to fix.