[Resolved] Multiple loops on homepage without duplicate posts

[Arthur]

I am trying to set up multiple loops on my homepage but would like to avoid displaying duplicates. I have the following code working but thinking it will be more efficient to combine these into one loop, to avoid using additional database resources for a high traffic site. Any help would be much appreciated.

`<?php
/**
* The main template file.
*
* This is the most generic template file in a WordPress theme
* and one of the two required files for a theme (the other being style.css).
* It is used to display a page when nothing more specific matches a query.
* E.g., it puts together the home page when no home.php file exists.
* Learn more: http://codex.wordpress.org/Template_Hierarchy
*
* @package GeneratePress
*/

/* CUSTOM CODE FOR HOMEPAGE */

if ( ! defined( ‘ABSPATH’ ) ) {
exit; // Exit if accessed directly.
}

get_header(); ?>

<section class=”main-col”>

<?php

/* CUSTOM LOOP FOR HERO POSTS – TIER 1*/

$args = array(
‘meta_key’ => ‘meta-box-dropdown’,
‘posts_per_page’ => 1,
‘meta_value’ => ‘Tier 1’,
);

$tier1_query = new WP_Query($args);

if ( generate_has_default_loop() ) {

if ( have_posts() ) :

while ( $tier1_query->have_posts() ) :

$tier1_query->the_post();

get_template_part( ‘content’,’tier1′);

//print get_post_meta( $post->ID, ‘meta-box-dropdown’, true );

endwhile;

/**
* generate_after_loop hook.
*
* @since 2.3
*/
do_action( ‘generate_after_loop’, ‘index’ );

else :

generate_do_template_part( ‘none’ );

endif;
}

wp_reset_query();

?>

</section>

<aside class=”sidebar-col”>

<?php

/* CUSTOM LOOP FOR HERO POSTS – TIER 2*/

$args = array(
‘meta_key’ => ‘meta-box-dropdown’,
‘posts_per_page’ => 4,
‘meta_value’ => ‘Tier 2’,
);

$tier2_query = new WP_Query($args);

if ( generate_has_default_loop() ) {

if ( have_posts() ) :

while ( $tier2_query->have_posts() ) :

$tier2_query->the_post();

get_template_part( ‘content’,’tier2′);

endwhile;

/**
* generate_after_loop hook.
*
* @since 2.3
*/
do_action( ‘generate_after_loop’, ‘index’ );

else :

generate_do_template_part( ‘none’ );

endif;
}
wp_reset_query();

?>

</aside>

>
<main id=”main” <?php generate_do_element_classes( ‘main’ ); ?>>

<h2>Latest Stories</h2>

<?php
/**
* generate_before_main_content hook.
*
* @since 0.1
*/
do_action( ‘generate_before_main_content’ );

wp_reset_query();

if ( generate_has_default_loop() ) {
if ( have_posts() ) :

while ( have_posts() ) :

the_post();

generate_do_template_part( ‘index’ );

endwhile;

/**
* generate_after_loop hook.
*
* @since 2.3
*/
do_action( ‘generate_after_loop’, ‘index’ );

else :

generate_do_template_part( ‘none’ );

endif;

}

/**
* generate_after_main_content hook.
*
* @since 0.1
*/
do_action( ‘generate_after_main_content’ );
?>
</main>

<?php
/**
* generate_after_primary_content_area hook.
*
* @since 2.0
*/
do_action( ‘generate_after_primary_content_area’ );

generate_construct_sidebars();

get_footer();
‘

[Tom]

Hi there,

This is likely somewhat out of scope for the forum here, but this solution I provided in our WPSP forum may help: https://wpshowposts.com/support/topic/stop-showing-duplicate-posts-on-the-same-page-post-using-a-different-shortcode/#post-15716

Basically, add this to the beginning of each loop:

global $added_ids;

$added_ids[] = get_the_ID();

Then add this to the args for each query:

global $added_ids;

// Exclude posts that have already been added.
$args['post__not_in'] = $added_ids;

Hope it helps 🙂

Documentation: http://docs.generatepress.com/
Adding CSS: http://docs.generatepress.com/article/adding-css/
Ongoing Development: https://generatepress.com/ongoing-development

[Arthur]

That worked great. Thank you Tom.

[Tom]

You’re welcome 🙂

Documentation: http://docs.generatepress.com/
Adding CSS: http://docs.generatepress.com/article/adding-css/
Ongoing Development: https://generatepress.com/ongoing-development

[Arthur]

On second thought, looks like the first post is being added to $added_ids twice. Any ideas why this might be happening?
Screenshot

[Tom]

If that post is being queried twice, it will be added to the array twice.

To prevent that, you can do something like this:

if ( ! in_array( get_the_ID(), $added_ids ) ) {
    $added_ids[] = get_the_ID();
}

Documentation: http://docs.generatepress.com/
Adding CSS: http://docs.generatepress.com/article/adding-css/
Ongoing Development: https://generatepress.com/ongoing-development

[Arthur]

Got it thank you. I added the code and seems to have helped eliminate the duplicate post. Now for some odd reason, the last post ID is not being added to the $added_ids array. I understand this probably out of scope of general theme support but if you have any clues that would be much appreciated Tom.

<?php 
			
			/* CUSTOM LOOP FOR HERO POSTS - TIER 2*/
						
			wp_reset_postdata();
				
			global $added_ids;
			
			$args2 = array(
			    'meta_key' => 'meta-box-dropdown',
			    'meta_value' => 'Tier 2',
			    'posts_per_page' => 4,
			    'post__not_in' => $added_ids,
			);
		
			$tier2_query = new WP_Query($args2);
		
			if ( generate_has_default_loop() ) {
		
				if ( have_posts() ) :

					while ( $tier2_query->have_posts() ) :
						

						global $added_ids;
						
						if ( ! in_array( get_the_ID(), $added_ids ) ) {
							$added_ids[] = get_the_ID();
						}							
								
						$tier2_query->the_post();
						
						print 'POST ID: '.get_the_ID();

						get_template_part( 'content','tier2');
		
					endwhile;
					wp_reset_postdata();

					/**
					 * generate_after_loop hook.
					 *
					 * @since 2.3
					 */
					do_action( 'generate_after_loop', 'index' );
		
				else :
		
					generate_do_template_part( 'none' );
		
				endif;
			}
				
			
				print ('<br><br>ADDED IDS: <br>');
				print_r($added_ids);

		?>

[Tom]

Hmm, it could be the in_array() check I suppose, it would take some playing with to figure out. Technically, every ID that runs inside a loop should be added to that global variable.

Documentation: http://docs.generatepress.com/
Adding CSS: http://docs.generatepress.com/article/adding-css/
Ongoing Development: https://generatepress.com/ongoing-development

[Author]

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