Wednesday, October 21, 2009

How to truly disable drupal cache

How to truly disable drupal cache

Drupal, like most CMSes uses cache intensively to speed things up. In a production site that is exactly what you what. However when developing, cache can cause you much pain.

If your an expert in drupal you probably already realized when you need to clear the cache in order to see changes and when not too. the developer module even makes it quite easy to do. However for me, and I am quite sure to quite a lot of other people it is not that clear.

"Wait", you might say. "Drupal has a disable cache setting". You would be right to say that. Only it doesn't completely disable the cache, only part of the cache, namely the page caching. To truly disable cache you need to do a bit of a hacking to the cache code. Yes I know they say to never hack core (cache is part of the core drupal release). for me this was worth it. I figure as long as you remember its there and don't use it in production you should be fine. The following piece of code needs to be added in include/ There are two functions there that you need to edit:

* cache_get
* cache_set

In cache_get place the code right after the global $user. In cache_set place it at the start of the function. Here is the code that you need to add.

if(variable_get('cache', CACHE_DISABLED) == CACHE_DISABLED) {
return 0;

Kudos for this hack goes to Rolf van der Krol. Cheers mate.

1 comment:

intuited said...

Just wanted to let you know that this can cause problems with multipart forms, since they are normally stored in the cache. use at own risk!