WP archive with custom field filter by taxonomy field

• vburlak

• November 12, 2014 at 1:17 am

Hi, community!

I’m using Roots.io Theme v.7 & ACF 4.3.9.
I have custom post type “Events” and added some custom fields using ACF.

I have 2 custom fields specified for cpt Events:

event_city — field type Post Object

event_category — field type Taxonomy

Аnd now, I’m creating custom post type archive with filter by custom fields using this manual — Creating a WP archive with custom field filter

I’m successfully created filtering by event_city. All works great.
But when I try to create filter by event_category — query result is always empty( fires if !have_posts(): ).

my pre_get_posts function looks like:

add_action('pre_get_posts', 'my_pre_get_posts');

function my_pre_get_posts( $query ){
	
	if( is_admin() ){
	    return;
	}
	if( !$query->is_main_query() ){
	    return;
	}
		
	$meta_query = $query->get('meta_query');
        
        if( !empty($_GET['event_category']) )
        {
	    $event_category = explode(',', $_GET['event_category']);
	    $meta_query[] = array(
                'key'		=> 'event_category',
                'value'		=> $event_category,
                'compare'	=> 'IN',
            );
        }

	// update the meta query args
	$query->set('meta_query', $meta_query);

	return;
}

I’m tried to modify tax_query instead of meta_query in pre_get_posts. But it’s almost breaks archive template and I went back to the meta_query.

When debugging this issue i’m using this links:
http://wp.local/events/?event_city=12 — work’s great
http://wp.local/events/?event_category=5 — don’t work’s

Also, I’m tried to modify query args just in archive template file. And all works fine — posts filtered by event_category. My events archive template file then looked:

<?php if (!have_posts()) : ?>
  <div class="alert alert-warning">
    <?php _e('Sorry, no results were found.', 'roots'); ?>
  </div>
  <?php get_search_form(); ?>
<?php endif; ?>

<?php 
	$args = array(
		'post_type' => 'events',
		'meta_query' => array(
		        array(
		            'key' => 'event_category',
		            'value' => array(8),
		            'compare' => 'IN'
		        )
		)
	);
?>

<?php query_posts($args); ?>
<?php while (have_posts()) : the_post(); ?>
  <?php get_template_part('templates/content', get_post_format()); ?>
<?php endwhile; ?>

Need help with that issue. I understand — that taxonomy terms have their archive templates. But i need to do it on main custom post type archive page with filtering.