Adds the Show units count admin callback in CPT

show_units_count_ac.php

<?php

function show_units_count_ac( $column, $post_id ) {

	if ( ! is_plugin_active( 'jet-booking/jet-booking.php' ) ) {
    	return '';
	}
	
	$units       = jet_abaf()->db->get_apartment_units( $post_id );
	$units_count = ! empty( $units ) ? count( $units ) : 0;

	return $units_count;
	
}

add_filter( 'jet-engine/post-type/predifined-columns-cb-for-js', function( $column_callbacks ) {
	
	$column_callbacks[ 'show_units_count_ac' ] = array(
		'description' => __( 'Show units count', 'jet-engine' ),
	);
	
	return $column_callbacks;
	
} );