How can I create a loop to build slides based on multiple categories using Coda Slider

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I’m using a loop to generate the slides I need for a Coda Slider slideshow. The slides should be pulling the most recent post from 5 different categories. The problem I’m having is that it’s pulling the 5 most recent posts from the 5 categories collectively and not individually. So it’s pulling 2 posts from the 1st category and then 1 from each of the others.

Any way to get this to work properly?

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This is the code I’m using: 

<?php 
$cat_post_query = new WP_Query($query_string . 'cat=7,8,10,9,11');
while ($cat_post_query->have_posts()) : $cat_post_query->the_post();
$do_not_duplicate = $post->ID;?>

<div>
* slide content *
</div>

<?php endwhile;  ?>
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1 comment

  1. For those who were interested in an answer to this question, I found the answer myself.

    <div class="coda-slider"  id="slideshow">    

<?php
// array of category IDs
$categories =  array(1,2,3,4,5);

foreach ($categories as $cat) :
  $post = false;
  $post = get_posts('cat='.$cat.'&posts_per_page=1');
  if($post) :
    $post = $post[0];
    setup_postdata($post); ?>

    <!-- rest of normal loop -->

    <div <?php post_class(); ?>>
      <h2 class="title">title used to dynamically generate thumbs in codaslider</h2>
      <h3><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title(); ?></a></h3>
      <?php the_content(); ?>
    </div>

  <?php endif; ?>
<?php endforeach; ?>  

</div>

    The original foreach loop code came from this post:

    http://wordpress.org/support/topic/display-most-recent-post-from-each-of-several-categories-on-home-page