how to select and show data comment by id post in codeigniter - codeigniter

Question

master peace of codeigniter. im new user for this framework.
i have problem to show comment data by id_diskusi in the single post of diskusi. i try to show data using 'where' in the lybrary code but its still not show the data. i hope the people at there can help me & solved this problem.
i use library to get data from database
public function setuju(){
$data=$this->CI->db->query("SELECT komentar.id AS id,
komentar.diskusi_id AS id_diskusi,
komentar.pilih AS pilih,
komentar.nama AS nama,
komentar.email AS email,
komentar.pesan AS pesan,
komentar.tanggal AS tanggal,
diskusi.diskusi_id as nomor_diskusi
FROM diskusi, komentar
WHERE diskusi.diskusi_status='publish' AND komentar.pilih='1' AND komentar.diskusi_id=diskusi.diskusi_id ORDER BY komentar.id DESC
");
return $data->result_array();
}
i use this code to filter data who data on komentar will be show by id of diskusi.
komentar.diskusi_id=diskusi.diskusi_id
but still not work
and its my controller
$data['setuju']=$this->diskusi->setuju();
code in the view
<div id="netral" class="tab-pane">
<?php
foreach ($netral AS $value) {
echo "<div class='box box-body no-border'>
<div class='row'>
<div class='col-md-2'>
<div class='box-profile'>"; ?>
<img alt='user image' style='margin-top:10px' class='profile-user-img img-responsive img-circle' src='<?php echo img_user_url('user.png'); ?>'>
<?php echo"
<h3><center>$value[nama]</center</h3>
</div>
</div>
<div class='col-md-10'>
<div class='callout callout-danger lead'><span class='pull-right'>".format_tanggal($value['tanggal'])."</span><br>
<p>$value[pesan]</p>
</div>
</div>
</div>
</div>";
}?>
</div><!-- /.tab-pane -->
<div class="box box-danger">
<div class="box-header with-border">
<div class="user-block">
<h3 class="no-margin">Tinggalkan Komentar</h3>
</div><!-- /.user-block -->
<div class="box-tools">
<button data-widget="collapse" class="btn btn-danger btn-sm"><i class="fa fa-minus"></i></button>
</div><!-- /.box-tools -->
</div>
<div class="box-body">
<form method='POST' id='komentar' action='<?php echo baseURL('form_visitors/komentar'); ?>' autocomplete='off' method="post" class="form-horizontal">
<div class="form-group">
<label class="col-sm-2 control-label" for="inputName">Name</label>
<div class="col-sm-10">
<input type="hidden" name="diskusi_id" value="<?php echo "$diskusi[id]";?>">
<input type="text" placeholder="Nama" data-original-title="Masukkan Nama" required='required' name="nama" id="inputName" class="form-control">
<input type='hidden' class='form-control' name='url' value='<?php echo current_url() ?>' />
</div>
</div>
<div class="form-group">
<label class="col-sm-2 control-label" for="inputEmail">Email</label>
<div class="col-sm-10">
<input type="email" name="email" data-original-title="Masukkan Email" placeholder="Email" required='required' id="inputEmail" class="form-control">
</div>
</div>
<div class="form-group">
<label class="col-sm-2 control-label"></label>
<div class="col-sm-10">
<div class="checkbox">
<label>
<input type="radio" name="pilih" value="1"> <i class="fa fa-thumbs-o-up margin-r-5 text-green"> <b>Setuju</b></i>
</label>
<label>
<input type="radio" name="pilih" value="2"> <i class="fa fa-square margin-r-5 text-yellow"> <b>Netral</b></i>
</label>
<label>
<input type="radio" name="pilih" value="3"> <i class="fa fa-thumbs-o-down margin-r-5 text-red"> <b>Tidak Setuju</b></i>
</label>
</div>
</div>
</div>
<div class="form-group">
<label class="col-sm-2 control-label" for="inputExperience">Komentar</label>
<div class="col-sm-10">
<textarea placeholder="Komentar" name="pesan" id="inputExperience" required='required' class="form-control"></textarea>
</div>
</div>
<div class='form-group'>
<label class="col-sm-2 control-label" for="inputExperience"></label>
<div class="col-sm-10">
<div id='recaptcha1'></div>
</div>
</div>
<div class="form-group">
<div class="col-sm-offset-2 col-sm-10">
<button class="btn btn-danger" type="submit" id="submit">Submit</button>
<div class="cssload" style="display: none; width: 100px">
<div class="cssload-tube-tunnel"></div>
</div>
</div>
</div>
</form>
</div>
</div>
how can i show comment data according with single post of diskusi who have comment. Thank you very much in advance! sorry for my english.

Answer 1

I can see you are fetching the data from two different tables but you have not used 'JOIN'.
you can try the following query string :
public function setuju(){
$data=$this->CI->db->query("SELECT komentar.id AS id,
komentar.diskusi_id AS id_diskusi,
komentar.pilih AS pilih,
komentar.nama AS nama,
komentar.email AS email,
komentar.pesan AS pesan,
komentar.tanggal AS tanggal,
diskusi.diskusi_id as nomor_diskusi
FROM komentar, diskusi
JOIN diskusi
ON diskusi.diskusi_id=komentar.diskusi_id
WHERE diskusi.diskusi_status='publish' AND komentar.pilih='1' ORDER BY komentar.id DESC
");
return $data->result_array();
}