Different content types on shared category archive page

[nkleekampMember]

Hello! I created a custom content type called "Publication" based on the portfolio content type code in the Executive Pro child theme, with some additions.

//* Create Publication custom post type
add_action( 'init', 'executive_publication_post_type' );
function executive_publication_post_type() {

	register_post_type( 'publication',
	array(
		'labels' => array(
			'name'          				=> __( 'Publications', 'executive' ),
			'singular_name' 				=> __( 'Publication', 'executive' ),
			'add_new'								=> __( 'Add New', 'publication'),
			'add_new_item'  				=> __( 'Add New Publication' ),
			'edit_item'							=> __( 'Edit Publication' ),
			'new_item'							=> __( 'New Publication' ),
			'all_items'							=> __( 'All Publications' ),
			'view_items'						=> __( 'View Publication' ),
			'search_items'  				=> __( 'Search Publications' ),
			'not_found'							=> __( 'No publications found' ),
			'not_found_in_trash'		=> __( 'No publications found in the Trash' ),
			'parent_item_colon'			=> '',
			'menu_name'							=> 'Publications'
		),
		'has_archive'  	=> true,
		'hierarchical' 	=> true,
		'menu_icon'    	=> get_stylesheet_directory_uri() . '/lib/icons/publications.png',
		'public'       	=> true,
		'menu_position' => 3,
		'rewrite'      	=> array( 'slug' => 'publication', 'with_front' => false ),
		'supports'     	=> array( 'title', 'editor', 'author', 'thumbnail', 'custom-fields', 'revisions', 'genesis-seo', 'genesis-cpt-archives-settings' ),
		'taxonomies'   	=> array( 'publication-type', 'category', 'post_tag' ),

		)
	);

}

I've also created the "Type" custom taxonomy in the publication custom content type.

//* Create Publication Type custom taxonomy
add_action( 'init', 'executive_publication_type_taxonomy' );
function executive_publication_type_taxonomy() {

	register_taxonomy( 'publication-type', 'publication',
	array(
		'labels' => array(
			'name'          => _x( 'Types', 'taxonomy general name', 'executive' ),
			'add_new_item'  => __( 'Add New Publication Type', 'executive' ),
			'new_item_name' => __( 'New Publication Type', 'executive' ),
		),
		'exclude_from_search' => true,
		'has_archive'         => true,
		'hierarchical'        => true,
		'rewrite'             => array( 'slug' => 'publications', 'with_front' => false ),
		'show_ui'             => true,
		'show_tagcloud'       => false,
		)
	);

}

When defining the "Publication" custom content type, I included category and post_tag in the taxonomies declaration, thinking that this would make post categories and tags available to my "Publication" custom content type. However, when I view a category, I only see posts with that category; my custom content type "publications" do not appear in the category archive page. How can I get all content types with the shared category to appear in the category archive page?

[nkleekampMember]

I found the answer on StackExchange and expanded it with a little more info from the Codex.

For anyone else that might need it, here was my solution.

//* Include Custom Post Types in author, category, and tag archive page
function __set_cpt_for_archives( &$query ) {
	$post_types = array( 'post', 'portfolio', 'publication' );
	$archive_types = array( 'is_author', 'is_tag', 'is_category' );

	foreach ( $archive_types as $key => $val ) {
		if ( $query->$val ) {
			$query->set( 'post_type', $post_types );
			remove_action( 'pre_get_posts', '__set_cpt_for_archives' );
		}
	}
}

add_action( 'pre_get_posts', '__set_cpt_for_archives' );

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