codeigniter output cache doesn't work?

Question

I'm using $this->output->cache(n) to cache webpage, but i cannot figure out how does it work.. I didn't find any cache files under system/cache folder...and also after I edit the page and show it again, the content changes, so it seems that the page is not really cached. Can anyone give a help? (i'm using phil's template lib) my code:

function show(){

    $this->output->cache(5);

    $this->load->model('page_model');
    $var = $this->uri->segment(3, 0); //get About page
    $row = $this->page_model->getPage($var);
    $this->template->title('about')
                   ->set_layout('default')
                   ->set_partial('styles', 'css')
                   ->set('data', $row->body)
                   ->build('about');

}

THANKS!

Colin Brock · Accepted Answer · 2012-04-10 16:22:33Z

3

Two things, as outlined in the documentation:

Warning: Because of the way CodeIgniter stores content for output, caching will only work if you are generating display for your controller with a view.

Perhaps not using the "native" views is an issue?

Additionally:

Note: Before the cache files can be written you must set the file permissions on your application/cache folder such that it is writable.

Are you sure your application/cache directory has the correct permissions?

edited Apr 10, 2012 at 16:22

answered Apr 10, 2012 at 15:54

Colin Brock

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3 Comments

Mario Over a year ago

Hi Colin and Philip, thank you for your reply! But is there other ways to use this cache method? because it seems that i cannot get rid of the template, i have to use it to build the site... Also,how to change the permission? I cannot find cache folder under system, but there is a cache folder under application... Sorry, i'm new to CI

Colin Brock Over a year ago

@Mario: Regarding your last question, that was my mistake. The directory is indeed application/cache. Regarding how to make CI's cache method work without CI views, you'd have to take a look "under the hood" of the Output class, find out how it works, and extend it as needed.

Colin Brock Over a year ago

@Mario: I forgot to address your other question - "How to change permissions?" It depends on what platform you're on, but you can easily find instructions for Windows, Linux, etc. by Googling for it. Hope that helps.

John Magnolia · Accepted Answer · 2015-08-30 17:40:15Z

1

Debug this file and check it's actually writing the cache: system/core/Output.php

// Do we need to write a cache file?  Only if the controller does not have its
// own _output() method and we are not dealing with a cache file, which we
// can determine by the existence of the $CI object above
if ($this->cache_expiration > 0 && isset($CI) && ! method_exists($CI, '_output'))
{
    $this->_write_cache($output);
}

This works well for me:

function _output($content) {
        // Load the base template with output content available as $content
        $data['content'] = &$content;

        $this->output->cache(600);

        $output = $this->load->view('base', $data, true);

        $this->output->_write_cache($output);

        echo $output;
    }

edited Aug 30, 2015 at 17:40

answered Aug 30, 2015 at 17:33

John Magnolia

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Comments

Thanh Phan · Accepted Answer · 2016-06-15 14:04:16Z

1

Are you sure your application/cache directory has the correct permissions?

you you to directories application/cache in cpanel , permissions become 777 is OK

answered Jun 15, 2016 at 14:04

Thanh Phan

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