Adding a custom field

uncode_custom_element_fields.php

/**
 *  in elements_php in theme, under uncode_create_single_block
 */
case 'relationship':
	$relationship = get_field('test_relationship', $block_data['id']);
	if($relationship) {
		foreach( $relationship as $r ) {
			$r_link = get_permalink( $r->ID );
			$r_title = get_the_title( $r->ID );
			$inner_entry .= '<a href="'.$r_link.'">'.$r_title.'</a>'.$separator;
			if ($r !== end($relationship)){
				$inner_entry .= '<br /> ';
			}
		}
	}
				break;
/**
 *in uncode_map.php in uncode_core plugin
 */
		array(
			'relationship',
			esc_html__('Relationship Links', 'uncode') ,
		) ,