Meta_query for nested repeater field values in a cpt.

• uvo

• December 12, 2024 at 12:42 pm

I have a cpt as a template for courses. Each course template can contain several courses. The courses are recorded in a repeater, which in turn contains a repeater for dates.
I need to query all course template that have a course without a date. My existing code to query only the first course of each template is:

$args = array(
'post_type' => 'kurs-vorlage',
'posts_per_page' => -1,
'meta_query' => array(
array(
'key' => 'kurse_repeater_0_daten_0_datum',
'compare' => '=',
'value' => '',
),
),
);

Customization with the $ sign returns no results:
$args = array(
'post_type' => 'kurs-vorlage',
'posts_per_page' => -1,
'meta_query' => array(
array(
'key' => 'kurse_repeater_$_daten_0_datum',
'compare' => '=',
'value' => '',
),
),
);

How can the meta-query be changed to check all courses in a template for an empty first date field? Thanks!