Create a Category Page for one Specific Category and Exclude this Category from the Main Page in WordPress

This blog serves as my digital notebook for more than eight years and I use to to collect all sorts of things, that I think are worth storing and sharing. Mainly, I blog about tiny technical bits, but recently I also started to write about my life here in Innsbruck, where I try to discover what this small city and its surroundings has to offer. The technical articles are written in English, as naturally the majority of visitors understands this language. The local posts are in German for the same reason. My intention was to separate this two topics in the blog and lot let the posts create any clutter between languages.

Child Themes

When tinkering with the code of your WordPress blog, it is strongly recommended to deploy and use a child theme. This allows to reverse changes easily and more importantly, allows to update the theme without having to re-implement your adaptions after each update. Creating a child theme is very easy and described here. In addition I would recommend using some sort of code versioning tool, such as Git.

Excluding a Category from the Main Page

WordPress offers user defined categories out of the box and category pages for each category. This model does not fit well for my blog, where I have static pages and a time series of blog posts on the main page. In order to prevent that the posts about Innsbruck show up at the main page, the category ‘Innsbruck’ needs to be excluded. We can create or modify the file functions.php in the child theme folder and add the following code.

<?php
add_action( 'wp_enqueue_scripts', 'theme_enqueue_styles' );
function theme_enqueue_styles() {
        wp_enqueue_style( 'parent-style', get_template_directory_uri() . '/style.css' );

}

// Exclude Innsbruck Category from Main Page
function exclude_category($query) {
     if ( $query->is_home() ) {
         // Get the category ID of the category Insbruck
         $innsbruckCategory = get_cat_ID( 'Innsbruck' );
         // Add a minus in front of the string
         $query->set('cat','-' . $innsbruckCategory);

      }
     return $query;
}
add_filter('pre_get_posts', 'exclude_category');

?>

This adds a filter which gets executed before the posts are collected. We omit all posts of the category Innsbruck, by adding a minus as prefix of the category ID. Of course you could also lookup the category ID in the administration dashboard, by hovering with your mouse over the category name and save one database query.

A Custom Page Specific for one Category

In the second step, create a new page in the dashboard. This page will contain all posts of the Innsbruck category that we will publish. Create the file page.php in your child theme folder and use the following code:

<?php
/**
 * The template for displaying all pages.
 *
 * This is the template that displays all pages by default.
 * Please note that this is the WordPress construct of pages
 * and that other 'pages' on your WordPress site will use a
 * different template.
 *
 * @package dazzling
 */

    get_header();
?>
    <div id="primary" class="content-area col-sm-12 col-md-8">
        <main id="main" class="site-main" role="main">

<?php
     // Specify the arguments for the post query
     $args = array(
        'cat' => '91', // Innsbruck category id
        'post_type' => 'post',
        'posts_per_page' => 5,
        'paged' => ( get_query_var('paged') ? get_query_var('paged') : 1),
    );

    if( is_page( 'innsbruck' )) {
        query_posts($args);
    }
?>

<?php while ( have_posts() ) : the_post(); ?>
    <?php get_template_part( 'content', 'post' ); ?>
    <?php
        // If comments are open or we have at least one comment, load up the comment template
        if ( comments_open() || '0' != get_comments_number() ) :
            comments_template();
        endif;
    ?>
<?php endwhile; // end of the loop. ?>


<div class="navigation">
    <div class="alignleft"><?php next_posts_link('&laquo; Ältere Beiträge') ?></div>
    <div class="alignright"><?php previous_posts_link('Neuere Beiträge &raquo;') ?></div>
</div>


    </main><!-- #main -->
</div><!-- #primary -->
<?php get_sidebar(); ?>
<?php get_footer(); ?>

In this code snippet, we define a set of arguments, which are used for filtering the posts of the desired category. In this example, I used the id of the Innsbruck category (91) directly. We define that we want to display posts only, 5 per page. An important aspect is the pagination. When we only display posts of one category, we need to make sure that Worpress counts the pages correctly. Otherwise the page would always display the same posts, regardless how often the user clicks on the next page button. The reason is that this button uses the global paged variable, which is set correctly in the example above.

The if conditional makes sure that only the pages from the Innsbruck category are displayed. The while loop then iterates over all posts and displays them. At the bottom we can see the navigational buttons for older and newer posts of the Innsbruck category.

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