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I have two custom fields for each post, vote_up and vote_down.

I know how to order by one of them, but I'm wondering how I can get the totals of both, subtract vote_down from vote_up and then display them according to the result of that calculation.

Ideas?

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    The easiest way might be to create a third custom field, vote_diff, and order by that. You could use a update_post_meta in a function to automatically calculate/enter the value of vote_diff when vote_up or vote_down changes. Where & how to do that will depend on where/how vote_up and vote_down are currently added/updated (plugin or theme or ....?).
    – Michelle
    Nov 10, 2016 at 16:23
  • @Michelle as an answer please :)
    – Rarst
    Nov 10, 2016 at 16:36
  • @Rarst done! I didn't know if I'd given enough detail to merit an actual answer but if you say so, it is so! :)
    – Michelle
    Nov 10, 2016 at 16:40

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Per Rarst's request, as an answer instead of comment :-):

The easiest way might be to create a third custom field, vote_diff, and order by that. You could use update_post_meta in a function to automatically calculate/enter the value of vote_diff when vote_up or vote_down changes. Where & how to do that will depend on where/how vote_up and vote_down are currently added/updated (plugin or theme or ....?).

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  • Bingo! I figured it out about a minute. :)
    – Nathan
    Nov 10, 2016 at 20:52

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