HELP: Filtering by ACF field in Archive

• benjamieson

• February 23, 2021 at 3:28 am

Hi All,

I have a CPT with an ACF group to build case studies (projects). One of the fields in the case study is a checkbox list of ‘disciplines’ pulled from a custom taxonomy.

I can display a full archive (/projects/), and I can display individual projects (/project/my-project-1) without issue.

In the individual project display, I have added a link to the key disciplines to link them to /projects/discipline=Discipline%20Name

on the archive page I have added the following to try and only display projects tagged with the discipline:

// args
if (!$_GET['discipline']) :
$args = array(
	'numberposts'	=> -1,
	'post_type'		=> 'case_study',
);
else :
$args = array(
	'numberposts'	=> -1,
	'post_type'		=> 'case_study',
	'meta_query'	=> array(
		'key'		=> 'discipline',
		'value'		=> $_GET['discipline'],
		'compare'	=> 'IN',
	)
);

endif;

var_dump($args);

$the_query = new WP_Query( $args );

// display project list 

The $args dump looks correct:

`array(3) {
[“numberposts”]=> int(-1)
[“post_type”]=> string(10) “case_study”
[“meta_query”]=> array(3) {
[“key”]=> string(10) “discipline”
[“value”]=> string(20) “This Discipline”
[“compare”]=> string(2) “IN” }
}

but the query isn’t affected and still displays all projects in the list.

Where am I going wrong?

I don’t need ‘live filtering’, just the link in a single project to be able to show a list of all projects in the same discipline.

Any pointers would be awesome – scoured the main docs, but can’t find any clues.

Ben

• benjamieson

• February 23, 2021 at 8:25 pm

UPDATE:

Sorted it.

Needed a tax_query

End result that allowed me to filter archive based on the taxonomy:

// Filter by Taxonomy when needed.
if ($_GET['discipline']) :
	$term = get_query_var('discipline');
	$args = array(
		'post_type' => 'case_study',
		'tax_query' => array(
			array(
				'taxonomy' => 'discipline',
				'field' => 'slug',
				'terms' => $term,
			)
		)
	);
else :
// show everything
	$args = array(
		'numberposts'	=> -1,
		'post_type'	=> 'case_study',
	);
endif;