My Model

retpost.php

<?php

class Retindpost extends CI_Model{
	
	function __construct(){
		
		parent::__construct();
	}

	public function ret_ind_post($id)

	{

		$this->load->database();
		$sql=$this->db->get_where('posts',array('id'=>$id));
		return $sql->result();
			
	}

	public function get_comments()

	{
		
	
	$comments=$this->db->join('posts','comments.id=posts.id')->select('content')->from('comments')->where('comments.parent_id =','posts.id')->get();	
	$comments->result();
	return $comments;
		
	}
}