Override Taxonomy Template

Question

I'm trying to list all the products tied to a specific taxonomy. For some reason the template won't work when trying to access "http://www.myexample.com/product_categories/funiture/", I tried taxonomy.php, taxonomy-term.php and nothing. Here's my code: http://pastie.org/7934453

add_action('init', 'register_cpt_product');

function register_cpt_product() {

    $labels = array(
        'name' => _x('Products', 'product'),
        'singular_name' => _x('Product', 'product'),
        'add_new' => _x('Add New Product', 'product'),
        'add_new_item' => _x('Add New Product', 'product'),
        'edit_item' => _x('Edit Product', 'product'),
        'new_item' => _x('New Product', 'product'),
        'view_item' => _x('View Product', 'product'),
        'search_items' => _x('Search Products', 'product'),
        'not_found' => _x('No products found', 'product'),
        'not_found_in_trash' => _x('No products found in Trash', 'product'),
        'parent_item_colon' => _x('Parent Product:', 'product'),
        'menu_name' => _x('Shop', 'shop'),
    );

    $args = array(
        'labels' => $labels,
        'hierarchical' => false,
        'supports' => array('title', 'editor', 'thumbnail', 'custom-fields', 'revisions', 'page-attributes'),
        'taxonomies' => array('Product Categories'),
        'public' => true,
        'show_ui' => true,
        'show_in_menu' => true,
        'menu_position' => 20,
        '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'
    );

    register_post_type('product', $args);
}

add_action('init', 'register_taxonomy_product_categories');

function register_taxonomy_product_categories() {

    $labels = array(
        'name' => _x('Product Categories', 'product_categories'),
        'singular_name' => _x('Product Category', 'product_categories'),
        'search_items' => _x('Search Product Categories', 'product_categories'),
        'popular_items' => _x('Popular Product Categories', 'product_categories'),
        'all_items' => _x('All Product Categories', 'product_categories'),
        'parent_item' => _x('Parent Product Category', 'product_categories'),
        'parent_item_colon' => _x('Parent Product Category:', 'product_categories'),
        'edit_item' => _x('Edit Product Category', 'product_categories'),
        'update_item' => _x('Update Product Category', 'product_categories'),
        'add_new_item' => _x('Add New Product Category', 'product_categories'),
        'new_item_name' => _x('New Product Category', 'product_categories'),
        'separate_items_with_commas' => _x('Separate product categories with commas', 'product_categories'),
        'add_or_remove_items' => _x('Add or remove product categories', 'product_categories'),
        'choose_from_most_used' => _x('Choose from the most used product categories', 'product_categories'),
        'menu_name' => _x('Product Categories', 'product_categories'),
    );

    $args = array(
        'labels' => $labels,
        'public' => true,
        'show_in_nav_menus' => true,
        'show_ui' => true,
        'show_tagcloud' => false,
        'show_admin_column' => false,
        'hierarchical' => true,
        'rewrite' => true,
        'query_var' => true
    );

    register_taxonomy('product_categories', array('product'), $args);
}

Answer 1

Take a look at the Codex:

• taxonomy-{taxonomy}-{term}.php - If the taxonomy were sometax, and taxonomy's term were someterm WordPress would look for
  taxonomy-sometax-someterm.php. In the case of Post Formats, the
  taxonomy is 'post_format' and the terms are post-format-{format}.
  i.e. taxonomy-post_format-post-format-link.php
• taxonomy-{taxonomy}.php - If the taxonomy were sometax, WordPress would look for taxonomy-sometax.php
• taxonomy.php

You registered your taxonomy as product_categories, so you should be using taxonomy-product_categories.php to create a template for all terms in that particular taxonomy.

Use taxonomy-product_categories-furniture.php to target only the one term referenced in your URL.

taxonomy.php will be used for all taxonomies.

Answer 2

Did you save the permalink after creating custom post type

Take a look at codex Custom Post Type Templates