How to turn custom-post archive into an overview page, listing the metadata of the posts?

In Taxonomy.php (Create on if have none) in your template folder
You should have something similer to this code:
(taxonomy are similer to archive.php but used for custom post type)

<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
    <!--=== TO GET THE TAXONOMY TITLE ===-->
    <h1><?php $term = get_term_by( 'slug', get_query_var( 'term' ), get_query_var( 'taxonomy' ) ); echo $term->name; ?></h1>
<?php endwhile; ?>
<?php endif; ?>

<?php if (have_posts()) : while (have_posts()) : the_post(); 

    // FIELDS NAME SHOULD REPLACE 'custom_field_name'
    $meta_value = get_post_meta($post->ID, 'custom_field_name', true);
    $meta_value2 = get_post_meta($post->ID, 'custom_field_name2', true);

    //THUMBNAIL
    $image_id = get_post_thumbnail_id();  
    $image_url = wp_get_attachment_image_src($image_id,'large');  
    $image_url = $image_url[0];  
?>
    <div class="productContainer">
    <?php echo get_the_post_thumbnail($post->ID, 'thumbNameDefined'); ?>
    <h3><?php the_title(); ?></h3>
    Value of something: <?php echo $meta_value; ?>
    Value of some Other thing: <?php echo $meta_value2; ?>
    </div>
<?php endwhile; ?>
<?php endif; ?>

In functions.php you should “enable” the use of thumbnail’s for that custom post type like you would for regular post… here is the line that does that for some custom post types in a theme i am currently building:

add_theme_support( 'post-thumbnails', array( 'post', 'engagement_ring', 'wedding_ring') ); // Add support for posts and custom post type
add_image_size( 'post', 250, 175, true );
add_image_size( 'engagement_ring', 300, 300 );
add_image_size( 'wedding_ring', 300, 300);

.
Please note that you should replace the word ‘thumbNameDefined’ in the first code i added with the name of the custom post type so it would appear..

This is (i think) above the information the avrage 5 year old child
could embed so i hope it helps you

Cheers, Sagive.

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