Using pre_get_posts not working

I’m trying to alter the order of posts displayed on a custom taxonomy archive page. I have created a custom taxonomy archive template, which is working fine. I am using the standard method of altering the query on this page, with the following code:

 function stage_tax_query_modifications( $query ) {
  if( $query->is_main_query() && $query->is_tax('custom-tax') ) {

    $query->set( 'orderby', 'date' );
    $query->set( 'order', 'DESC' );

add_action('pre_get_posts', 'stage_tax_query_modifications');

But nothing I enter here (and I have tried a few different valid values for ‘orderby’ and ‘order’) alters the posts at all. I am wondering if it is something to do with the theme wrapper?

Any help appreciated!

Where have you defined the function and action?

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I have put it in extra.php

It’s not the wrapper. You can test in one of the twenty* themes, but it looks like these changes in 4.0 are the issue:

Are you seeing any errors/warnings? I assume you have WP_DEBUG on.

If you’re using Sage 8.*, then it also looks like you’re missing the Namespace when passing the function name.


No - I tested with 2015 theme and my function works perfectly, so must be something about Sage…

Ah thank you - how do I pass the Namespace?

No worries, got it…thank you!

Hey @josephclawrence – could you elaborate how you got things running? Am struggling myself to use a similar function. Thanks!

It was a while ago now, but I think I followed the Namespace guidelines outlined at this link:

Allright, just found that post too, will try my best!

Thanks guys for the help. For future readers not wanting to dig through the doc, here’s the working code :

add_action('pre_get_posts', __NAMESPACE__ . '\\stage_tax_query_modifications');
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