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I want to make an auto-tag editor to clean up duplicate tags, so for example I could set all questions tagged "plugin" to be retagged "plugins".

If I run process_event on the q_post and q_edit events, and change the tags on the question, when the page finishes loading will the new tags be visible? Or is the template all loaded before the event runs?

1 Answer

+1 vote
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Yes, they run immediately after the corresponding event happened, often in the functions in qa-app-post-create.php and qa-app-post-update.php.

In the case of what you want to do, you'll first need to change the tags in the database, but then also call qa_post_unindex() then qa_post_index(...) using the values passed to your event handler, to make sure everything else is updated.

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Finally getting round to doing this. One more question: do the events run after the content has already been added to the database? If I have to reindex, it sounds like it. But this would mean on every post, double the number of queries might be running, e.g. a post is saved to the database then I run another query to edit the tags.

This could also pose problems if I want to delete nonsense tags like "i" or "how" because now a question might not have any tags at all. Not sure if there is a way round that though.
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Also, assuming it's run after content is in the database, is there a method to re-save content? On q_post for example you get a $params array containing the question content. If you edit that array can you call a function to save it back to the database?
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In general, the events run last, so yes, it's after the content has been posted to the database. For modifying database content, take a look at the functions in qa-app-posts.php - but note these will themselves throw events unless you call qa_suspend_event_reports(...) so be on the lookout for infinite loops.
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edited by
Is this code correct? It still seems to be doing an infinite loop:

qa_suspend_event_reports(true);
require_once QA_INCLUDE_DIR.'qa-app-posts.php';
qa_post_set_content( $params['postid'], $params['title'], $params['content'], $params['format'], $tags );
qa_suspend_event_reports(false);

EDIT: Scratch that, I think MySQL was still in an infinite loop. Restarted Apache and it seems to be working now. Thanks for your help, Gideon!
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