Codeigniter - Access Models And Database on Routing

问题

I'm Planning to make a project in codeigniter 3.0.3 and I want to use routing like below.

1) . www.mydomain.com/categoryNamehere
2) . www.mydomain.com/postNameHere

I have a separate table in my database to keep category names with their unique id's.
What I want is when a user click on a link like www.mydomain.com/xxxxx
1.first check on category table (xxxxx)
2. if no match send it (xxxxx) to post controller.
How can I implement this on Codeigniter 3.0.3 ?
I tried to access my models in config / routing.php and also I tried to execute mysql codes (active records) directly in routing page.

回答1:

To implement the proposed url structure, we must create one central dispatcher that would

1. Analyze the requested URL.
2. Would query a database to find and display the category.
3. If no category found it would try to find and display the text post.

Sounds like the job for a controller. But how do we make a controller that responds to every request? With the help of wildcard routing!

application/config/routes.php

$route['.*'] = 'default_controller';

Now every request, regardless of URI, will be routed to Default_controller.php.

But how do we write controller without knowing what method will be called? There is a way: the built-in in controller service method _remap.

From the docs:

If your controller contains a method named _remap(), it will always get called regardless of what your URI contains.

So I've let myself fantasize and create a concept Default_controller for you:

application/controllers/Default_controller.php

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

class Default_controller extends CI_Controller {

    // Pseudocode ensues 
    public function _remap()
    {
        // www.mydomain.com/(someTextHere)
        $slug = $this->uri->segment(1);

        $result = $this->load_data($slug);

        echo $result;
    }

    private function load_data($slug)
    {
        // Trying to find a category
        $category = $this->category_model->find($slug);
        if($category !== false)
        {
            // Presumably loads view into buffer
            // and returns it to the calling method
            return $this->load_category($category);
        }

        Trying to find post
        $post = $this->post_model->find($slug);
        if($post !== false)
        {
            return $this->load_post($post);
        }

        // Neither category nor post found
        show_404();
    }

    private function load_category($category)
    {
        // http://www.codeigniter.com/user_guide/general/views.html#returning-views-as-data
        return $this->load->view("category", array("category" => $category), true);
    }
}

Note: tested this answer on the freshly downloaded Codeigniter 3.0.3

来源：https://stackoverflow.com/questions/34229664/codeigniter-access-models-and-database-on-routing