Query all posts of author even if he/she is co-author

Hello @sikorat ??

The following query fetches all posts of a certain author and/or guest author:

$args = array(
  'post_type' 	   => 'post',
  'author_name'	   => $person->user_nicename,
  'posts_per_page' => -1
);

$query = new WP_Query( $args );
$query->posts;

I also noticed two mistakes in your code:

1. $person -> ID → This variable should not contain spaces. The correct version should be $person->ID.
2. author__in → This parameter expects an array. The correct call would be 'author__in' => array( $person->ID ).

As for the snippet I posted above, please note that author_name works with both authors and guest authors, while author, author__in and author__not_in only works with authors, but not with guest authors.

Hi thank you for this reply, but sadly this doesn’t work.

$args              = array(
'post_status'    => 'publish',
'posts_per_page' => 3,
'author_name'	   => $person->user_nicename,
'post_type'      => 'video',
);

With this args it doesn’t show video’s(custom post type) by current user, it shows posts of this user but not from this custom post type.
When I delete “author_name” query is showing posts of this custom post type, so it looks like it is issue white this field and not with post_type.
When i use 'author__in' => $person -> ID I see posts of this user in this cpt but not guest posts.
Do you know how to fix it?

@sikorat
Co Authors Plus taxonomy ‘author’ is attached to the post_type ‘guest-author’. The tax_query looks up ‘term_relationship’ table for posts by assigned coauthor_id (post_id) from the ‘term_taxonomy_id’ matched by taxonomy = ‘author’ and term_id = ‘$person->ID’. I’m not sure the $person->ID you obtain is a guest-author or a user.

/**
 * WP_Query args setting
 * @link https://developer.www.ads-software.com/reference/classes/wp_query/
 */
$args = array(
	/* to search all post types, set to 'any' 
	 * or omit, defaults to 'any' when tax_query is set
	 * or limit multiple values with array( 'video', 'post' )
	 */
	'post_type'      => 'video', 
	'post_status'    => 'publish',  //omit, default is 'publish'
	'posts_per_page' => 3,
	'tax_query' => array( array( 
		'taxonomy' => 'author',
		'field'    => 'term_id',
		'terms'    => $person->ID,
	) ) 
);

Example in use:

/**
 * WP PHP coding standards
 * @link https://make.www.ads-software.com/core/handbook/best-practices/coding-standards/php/
 */

/**
 * Check if on an existing author archive page
 * Guest author is not a user, therefore the typical 'author_id' is not a user_id.
 * Guest author is stored as a post, guest_id = post_id
 *
 * @link https://developer.www.ads-software.com/reference/functions/is_author/
 * @link https://developer.www.ads-software.com/reference/functions/get_queried_object/
 */
if ( is_author() ) : 
	$guests = array( get_queried_object() );
elseif ( is_single() ) :
	$guests = get_coauthors();
else :
	return; //no point continuing
endif;

foreach ( $guests as $guest ) : 
	$args = array(
		'post_type'      => 'video', //or array( 'video', 'post' )
		'posts_per_page' => 3,
		'tax_query' => array( array( 
				'taxonomy' => 'author',
				'field'    => 'term_id',
				'terms'    => $guest->ID,
		)	) 
	);

	$kq = new WP_Query( $args );

	if ( $kq->have_posts() ) :
		?>

		<ul data-author="<?php echo $guest->ID; ?>" class="resources__list">
			<?php
			while ( $kq->have_posts() ) : $kq->the_post(); 

				get_template_part( 'template-parts/content', 'article' );

			endwhile; 
			wp_reset_postdata();
			?>
		</ul>

		<?php
	else :
		echo "<!-- 'no posts matched query' -->";
	endif;
endforeach;

@backbone

Thanks for this code – it is essentially what I needed for a project I am working on however, I am trying to pull posts from another site in a WP Multisite network. I am essentially using the same code but it is returning no results. Any thoughts here?

Essentially here is what I am doing:

$author_ID = get_sub_field('author_id');
switch_to_blog(2);
$posts = get_posts(
                  array(
                    'post_type' => 'post',
                    'posts_per_page' => 4,
                    'tax_query' => array( array( 
		      'taxonomy' => 'author',
		      'field'    => 'term_id',
		      'terms'    => $author_ID,
	             ) )
                  )
                );

Based on some research, it seems with multisite the taxonomy needs to exist on the site you are querying from, in this case blog 1. So, I did enable Co-Authors plugin on that site and created a test post with multiple authors but still no results.

Thoughts?