Reply To: Filter by field name

• marko_grcich

• November 15, 2016 at 1:03 am

John, thank you for your help, i figured out what the problem was, after I used your meta_query code, it didn’t work, but then I started to do a bit more research, and it turns out the problem was in the $value var.

I changed
$value = explode(',', $_GET[ $name ]);

to $value = $_GET[ $name ] and it worked flawlessly.

To help anyone else, my whole code was:

function lang_pre_get_posts( $query ) {

    // array of filters (field key => field name)
    $GLOBALS['my_query_filters'] = array( 
        'field_1'	=> 'event_country'
    );
	
	// bail early if is in admin
	if( is_admin() ) {	
		return;
	}
	
	// get meta query
	$meta_query = $query->get('meta_query');

	// loop over filters
	foreach( $GLOBALS['my_query_filters'] as $key => $name ) {
		
		// continue if not found in url
		if( empty($_GET[ $name ]) ) {
			continue;
		}

		if( ! $query->is_post_type_archive() ) return;
		
		// get the value for this filter
		$value = $_GET[ $name ];
		
		// append meta query
        $meta_query[] = array(
          'relation' => 'OR',
            array(
              'key' => 'event_country',
              'value' => '"'.$value.'"',
              'compare' => 'IN'

           ),
            array(
              'key' => 'event_country',
              'value' => '"'.$value.'"',
              'compare' => 'LIKE'
            ),

        );
        
	} 

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

add_action('pre_get_posts', 'lang_pre_get_posts', 10, 1);