Display more than 10 posts on author.php file

Question

it seems that there are only 10 posts being displayed on author.php file. The theme I'm using have just this in author.php file:-

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

<?php endwhile; ?>
<?php wt_pagination(); ?>

The loop is getting only first 10 posts (of the author). How can I change it to first 30 posts. Without writing a secondary (custom) loop.

Answer 1

when you use the loop the number of post displayed is choosen fron the option set in Settings->Reading in you backend. It affects all the standard loops, not only the author page.

To change only for author page you have to use pre_get_posts hook and set the wanted number of posts using posts_per_page argument:

add_action('pre_get_posts','change_numberposts_for_author');

function change_numberposts_for_author( $query ) {
  if ( ! is_admin() && $query->is_main_query() && is_author() ) {
    $query->set('posts_per_page', 30); // 30 is the number of posts
  }
}

See also is_author() on Codex