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How to efficiently invalidate cache?

How to invalidate a views cache based on custom criteria?

  • I have a custom content type (story) with a datetime field which determines if a story shows up in a the views that list the nodes of that content type; if the datetime defined for a node is newer than the current datetime, it will not show up. My problem is that I have to go and empty admin/config/development/performance and click "Clear all caches" or uncheck "Cache pages for anonymous users". I would like to keep caching pages for anonymous users, so I am looking for other options. Any help is much appreciated.

  • Answer:

    It sounds like the problem is not views being cached, but that the entire page is being cached. If Drupal have a complete page cached, it doesn't matter if the view is cached or not. What you need to do, it to conditionally disable the page cache, or prevent Drupal caching that page in the first place. There have been some http://drupal.org/node/875152 about how to do the first, but this is not something I have tested or can advise. Be warned, that messing with the Drupal caching system can give some unforeseen problems. An alternative solution would be to empty the page cache or invalidate the cache for that particular page once a day/hour to make sure that it's relatively up to date. This is probably the route I would take in this situation.

Egil Hansen at Drupal Answers Visit the source

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I have a patch for boost that does exactly what you want, because that is a requirement of our setup. Problem is it needs an external crawler; we check for new content every 30 seconds across our 1,100 domains and re-crawl them. What you want can be done; But I'm still working on the details of making it work for the average setup. This is also for D6, so not much help for you. Long story short you need something external to see if the time is up OR some logic in settings.php that handles this. That something external would be cron most likely.

mikeytown2

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