How to order results by date and meta key?

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I’m using wp-postratings to rate posts which stores the rating as a custom meta value ratings_score. It gives you the option to use r_sortby to order the loop by highest rated but I want to give it a trending feel by dividing the $ratings_score” by how old the post is in days. So something like this.. 

$ratings_score = get_post_meta($post->ID,'ratings_score',true);
orderby = $ratings_score / days ago

How can I accomplish this?

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2 comments

  1. You could do this by sorting on a calculated factor. Dividing the rating by the days gives a good starting point:

    rating/days = factor (e.g. 15/6 = 2.5 or 11/3 = 3.6)

    You can balance this to your needs by multiplicate the variables (rating and day) with any factor you like.

    There are to ways to implement such a factor:

    1. use wp-crons to hourly refresh the factor for each post and save the value as postmeta. So you can easily use a WP_Query and sort the posts by the meta_value_num.
    2. calculate the factor directly in your post-loop
  2. $args = array( 'post_type' => 'product', 'numberposts' => -1, 
       'orderby' => 'meta_value_num', 'order' => get_query_var('order'), 
       'meta_key' => '_price' );
$lastposts = get_posts( $args );