Post Navigation Does Not Conform to Query Arguments

  • [ Moderator note: moved to Hacks. ]

    I’ve been experimenting with custom queries (by creating new instances of WP_Query) configured for different types of post orderings. I’ve noticed what I believe is a bug in the WordPress core code, but before I submit it as such, I want to make sure I’m understanding things correctly.

    I create a new WP_Query configured to order posts by title or name, in ascending order. The query does indeed return the list of posts in correct order. However, the “get_next_post()” and “get_previous_post()” functions still show the posts according to the default ordering (most recent to least recent). I did some digging into these functions and I believe the problem is that everything ultimately ends up going to the “get_adjacent_post()” function in “/wp-includes/link-template.php”.

    Well, guess what? This function “get_adjacent_post()” is HARD CODED to override any ordering by an invocation of the apply_filters() function. Here is an excerpt directly from the latest code:

    $sort = apply_filters( "get_{$adjacent}_post_sort", "ORDER BY p.post_date $order LIMIT 1", $post );

    This is taken directly from line 1714 of that file, and is invoked just before the query is actually executed.

    I don’t see how I can override this behavior without modifying core source code–which I really don’t want to do.

    Maybe I’m misunderstanding how to get my next and previous links to render correctly, but I do think this is a bug.

    If someone has a work-around, I’d sure like to hear it!

    Thanks,

    David

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  • Moderator bcworkz

    (@bcworkz)

    The apply_filters() call is a clue to exactly how you can modify the sort order without modifying core code. Read up on using filters.

    Once you basically understand filters, the rest of this will make more sense: When you add your filter hook, substitute either “previous” or “next” for {$adjacent}. You can add the same callback twice, once for each value, since it’s unlikely sort order is different for each direction.

Viewing 1 replies (of 1 total)
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