Using database meta_values to calculate new post order using pre_get_posts or a ‘request’ hook

The other day I was thinking on how to make something like this, I would recommend to save the hottnes as a post meta value, that is updated on every vote, save or update, for that you will need the save_posts filter and then you can get the posts ordered with pre_get_posts and a meta query something like

$query->set('meta_key'=>'hottnes');
$query->set('orderby'=>'meta_value_num');
$query->set('order'=>'DESC');

Hope this helps.

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