Welcome.php

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Welcome extends CI_Controller {

    function __construct() {
        parent::__construct();
        $this->load->model('blogpost_model');
        $this->load->model('categories_model');
    }

	public function index()
	{
        $data = array(
            'posts' => $this->blogpost_model->getHome(),
            'categories' => $this->categories_model->getAll()
        );

		$this->load->view('blog', $data);
	}

	public function view($id)
	{
		$this->db->join('users', 'users.id = blogpost.id_author');
		$detail = $this->db->get_where('blogpost', array('blogpost.id' => $id))->result();
		$data = array(
			'detail' => $detail,
			'categories' => $this->categories_model->getAll()
		);

		$this->load->view('detail', $data);
	}
}