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HELP: Filtering by ACF field in Archive

  • 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',
    $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.



    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(
    				'taxonomy' => 'discipline',
    				'field' => 'slug',
    				'terms' => $term,
    else :
    // show everything
    	$args = array(
    		'numberposts'	=> -1,
    		'post_type'	=> 'case_study',
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