Display posts from Custom Post Type in category page on front-end

2 comments

1. You are better off separating categories for posts and using custom taxonomy types for CPT categories.

   You’d add this line to your register cpt code

   'taxonomies'   => array( 'bizdirectory-type' ),
   

   Replacing this line in your code.

   'taxonomies' => array( 'category' ),
   

   And then add this code in your functions.php

   add_action( 'init', 'wpsites_custom_taxonomy_types' );
   function wpsites_custom_taxonomy_types() {
   
   register_taxonomy( 'bizdirectory-type', 'bizdirectory',
       array(
           'labels' => array(
               'name'          => _x( 'Types', 'taxonomy general name', 'wpsites' ),
               'add_new_item'  => __( 'Add New Bizdirectory Type', 'wpsites' ),
               'new_item_name' => __( 'New Bizdirectory Type', 'wpsites' ),
           ),
           'exclude_from_search' => true,
           'has_archive'         => true,
           'hierarchical'        => true,
           'rewrite'             => array( 'slug' => 'bizdirectory-type', 'with_front' => false ),
           'show_ui'             => true,
           'show_tagcloud'       => false,
       ));
   
   }
   

2. I have found the answer, I had completely misunderstood the differences between standard post types and custom post types, as well as their taxonomies. I found several very helpful articles and the code below is what I ended up with, as well as a few of the articles that I found helpful. I hope others find this useful.

   // Load Custom Post Type 
   function add_directory() {
       $labels = array( 
       'name'               => __( 'Businesses', 'text_domain' ),
           'singular_name'      => __( 'Business', 'text_domain' ),
           'add_new'            => __( 'Add New Business', '${4:Name}', 'text_domain' ),
           'add_new_item'       => __( 'Add New Business', 'text_domain}' ),
           'edit_item'          => __( 'Edit Business', 'text_domain' ),
           'new_item'           => __( 'New Business', 'text_domain' ),
           'view_item'          => __( 'View Business', 'text_domain' ),
           'search_items'       => __( 'Search Businesses', 'text_domain' ),
           'not_found'          => __( 'No Businesses found', 'text_domain' ),
           'not_found_in_trash' => __( 'No Businesses found in Trash', 'text_domain' ),
           'parent_item_colon'  => __( 'Parent Business:', 'text_domain' ),
           'menu_name'          => __( 'Business Directory', 'text_domain' ),
       );
       $args = array( 
           'labels'              => $labels,
           'hierarchical'        => true,
           'description'         => 'description',
           'taxonomies'          => array( 'biz-cat' ),
           'public'              => true,
           'show_ui'             => true,
           'show_in_menu'        => true,
           'menu_position'       => 5,
           //'menu_icon'         => '',
           'show_in_nav_menus'   => true,
           'publicly_queryable'  => true,
           'exclude_from_search' => false,
           'has_archive'         => true,
           'query_var'           => true,
           'can_export'          => true,
           'rewrite'             => true,
           'capability_type'     => 'post', 
           'supports'            => array( 'title', 'editor', 'author', 'thumbnail', 'custom-fields', 'revisions', 'post-formats' ),
       );
       register_post_type( 'bizdirectory', $args );
   }
   add_action( 'init', 'add_directory' );
   
   // Create Custom Taxonomy
   function directory_create_taxonomies() 
   {
       register_taxonomy( 'biz-cat', array( 'bizdirectory' ), array(
           'hierarchical' => true,
           'label' => 'Business Categories',
           'singular_name' => 'Business Category',
           'show_ui' => true,
           'query_var' => true,
           'rewrite' => array( 'slug' => 'biz-cat' )
       ));
   }
   add_action( 'init', 'directory_create_taxonomies', 0 );
   
   // 'bizdirectory' is the registered post type name
   function directory_columns($defaults) {
       // 'biz-cat' is the registered taxonomy name
       $defaults['biz-cat'] = 'Business Category';
       return $defaults;
   }
   function directory_custom_column($column_name, $post_id) {
       $taxonomy = $column_name;
       $post_type = get_post_type($post_id);
       $terms = get_the_terms($post_id, $taxonomy);
   
       if ( !empty($terms) ) {
           foreach ( $terms as $term )
               $post_terms[] = "<a href='edit.php?post_type={$post_type}&{$taxonomy}={$term->slug}'> " . esc_html(sanitize_term_field('name', $term->name, $term->term_id, $taxonomy, 'edit')) . "</a>";
           echo join( ', ', $post_terms );
       }
       else echo '<i>Not assigned.</i>';
   }
   add_filter( 'manage_project_posts_columns', 'directory_columns' );
   add_action( 'manage_project_posts_custom_column', 'directory_custom_column', 10, 2 );
   

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