How do I override the default number of items to be listed on an archive.php page? [duplicate]

Question

Possible Duplicate:
How To Modify The Loop in archives.php To Have 11 Posts Per Page and CSS Styling

I am using the following code on my archive.php template to list a few fields from a custom post type. It's an album review post type and this code pulls in the artist name, the album name and the album cover.

Is there any way to alter this code to tell wordpress to display a certain number of results?

The issue I have is that for all other archive pages the default (set to 10) is fine, but because I am only displaying a thumbnail and a name on the archive for reviews there's a lot of room to add more in.

Answer 1

You can hook into pre_get_posts and modify the query. Your hooked function will receive a WP_Query object as it's only argument. You can check to see if you're on a the correct post type archive and modify away.

Something like this:

<?php
add_action('pre_get_posts', 'wpse63675_pre_posts');
function wpse63675_pre_posts($q)
{
    if(!is_post_type_archive('your_album_type'))
        return;

    $q->set('posts_per_page', 20); // or however many you want
}

You can drop the above in your functions.php file or a plugin. Use with caution.

I wrote a plugin that takes care of this for you. It does the above, but with a set of fields in the admin area.