Problem: I would like to give my site visitors the ability to use a checkbox in a custom search View that filters based on whether or not the post has child posts.
Solution: This filter is not built-in to Views, but you can set up a custom field on the parent post type that stores a 1 if child posts exists and stores nothing if no child posts exist. That custom field value can be managed automatically with code.
add_action( 'toolset_association_created', 'toolset_number_child_posts', 10, 5 );
add_action( 'toolset_before_association_delete', 'toolset_number_child_posts', 10, 5 );
function toolset_number_child_posts( $relationship_slug, $parent_id, $child_id, $intermediary_id, $association_uid ) {
// add a 1 if child properties exist to facilitate filtering by existence of child post
if( get_post_type($parent_id)=='developments' ) {
// get most recent property post
$property_args = array(
'numberposts' => 1,
'post_type' => 'property',
'orderby' => 'post_date',
'order' => 'DESC',
'toolset_relationships' => array(
'role' => 'child',
'related_to' => $parent_id,
'relationship' => 'developments_property'
),
);
$properties_query = new WP_Query( $property_args );
$properties = $properties_query->posts;
if(isset($properties[0])) {
// set the checkbox custom field value here using update_post_meta
update_post_meta( $parent_id, 'wpcf-has-vacant-properties', 1);
}else {
delete_post_meta( $parent_id, 'wpcf-has-vacant-properties');
}
}
}
function toolset_count_child_properties_on_save( $post_id ) {
if( get_post_type( $post_id ) == 'developments' ) {
toolset_number_child_posts( 'developments_property', $post_id, null, null, null );
}
}
add_action( 'save_post', 'toolset_count_child_properties_on_save', 1000);
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