11

We have a custom services module and a site in Drupal 7, and I got the task to delete the cache after the editor adds new content or update the existing ones.

I've read about a module called Cache Actions, but, as i said, i need to create the function on my custom module.

Also, I've started reading about Drupal hooks, but still don't have a clue of how to implement this task. Any suggestions? Thanks.

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  • This could be implemented in a few ways. How often does your editor update/delete/add new content? – Peter Oct 23 '12 at 22:30
  • Very often, because we use drupal as the manager of the data to make web services for mobile apps. I couldn't tell you exactly how frequently we add or modify data, but the main request is to clear the cache every time a change happens. – Erzei Oct 24 '12 at 1:00
12

It sounds like you've already got a custom module, but just in case you haven't see the Module Developer's Guide.

The hooks you're looking for are hook_node_insert() and hook_node_update(), and the function to clear the cache will either be cache_clear_all() or drupal_flush_all_caches. The former will let you clear specific cache bins (and even specific cache items), and the latter will clear absolutely everything.

For example:

function MYMODULE_node_insert($node) {
  drupal_flush_all_caches();
}

or to clear only the static page cache after a node has been updated:

function MYMODULE_node_update($node) {
  $nodeurl = url('node/'. $node->nid, array('absolute' => TRUE));
  cache_clear_all($nodeurl, 'cache_page');
}
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  • Ok, i understand it. Just one more question, do i have to add the code in my .module file or in the node module file of drupal? – Erzei Oct 24 '12 at 1:14
  • 2
    It goes in your own module file, hacking core files is a big no-no in Drupal :) – Clive♦ Oct 24 '12 at 23:32
1

You can easily clear specific node cache after updating them. Ex. : 

function MYMODULE_node_update($node) {
  $nodeurl = url('node/'. $node->nid, array('absolute' => TRUE));
  cache_clear_all($nodeurl, 'cache_page');
}

Please note that you must need to specify array('absolute' => TRUE).

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