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I have posts which assigned 1 of 2 different categories.

On the single post view i want to show a next and previous link of posts with the SAME category.

This should be straightforward, i've tried using get_previous_post etc but i cannot exclude posts assigned to the other category.

I've tried

$prevPost = get_adjacent_post(TRUE,'129',TRUE);

where 129 is the id of the category i want to exclude, but this does not work.

The posts are assigned categories correctly i.e. they are not assigned both categories.

The query is as follows 

SELECT p.ID FROM wp_posts AS p INNER JOIN wp_term_relationships AS tr ON p.ID = tr.object_id INNER JOIN wp_term_taxonomy tt ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE p.menu_order < '2' AND p.post_type = 'post' AND p.post_status = 'publish' ORDER BY p.menu_order DESC LIMIT 1

As you can see it doesn't reference the category to exclude.

Is this a wordpress bug or am i missing something here?

Thanks,

Sophie

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1 Answer 1

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Use the_post_navigation( $args ); to display next and previous links in your template for a single post. To restrict links to the same category, your $args array, in its simplest form, should be:

$args = array(
    'in_same_term' => true,
    );

Other parameters are optional. Get their list here.

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  • This doesn't work for me, it still pulls through a post with a different category. I'm setting 'in_same_term' to true in my previous example but it doesn't seem to have any effect.
    – Sophie Baxter
    May 3, 2017 at 15:10
  • Try to add 'taxonomy' => 'category', to your $args array. I didn't do it because 'category' is supposed to be a default.
    – Frank P. Walentynowicz
    May 3, 2017 at 20:43
  • No joy unfortunately. Still not working as expected. There's an issue with get_adjacent_post i think, it constructs $where based on the term you've excluded here github.com/WordPress/WordPress/blob/master/wp-includes/… , then it changes $where here so that it doesnt exclude that term github.com/WordPress/WordPress/blob/master/wp-includes/…
    – Sophie Baxter
    May 4, 2017 at 9:50
  • Do not use $prevPost = get_adjacent_post(TRUE,'129',TRUE); and use standard query. Display all posts. When you select a single post, your 'next' and 'previous' links should select posts within SAME category.
    – Frank P. Walentynowicz
    May 4, 2017 at 11:25

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