[wp-hackers] Order posts by time of their last comment

[Aaron Jorbin]

On 9/27/10, Christian Foster <christian.foster at gmail.com> wrote:
> Hi,
>
> I have a requirement to list posts by the time of their last comment.
> I am trying to keep it simple, the current page which lists by other
> factors like post type uses a slightly modified pagination function
> with a pre_get_posts filter to set the required query parameters, we
> have tens of thousands of posts of different types so the pagination
> is very important.
>
> Can anyone think of a good way to sort a large number of posts by the
> date of their last comment? Is it then possible to use the same
> pagination function and posts_per_page/paged query variables?
>
> Cheers,
>
> Chris.
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I would add a post_meta field for the date/time of most recent comment
and hook into comment_post and wp_set_comment_status to update it. You
can then order by the meta value.

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