Set candidate_photo as featured image/thumbnail for Resumes when using WP Job Manager Field Editor

functions.php

<?php

add_action( 'resume_manager_update_resume_data', 'smyles_set_featured_image_from_candidate_photo', 9999, 2 );

function smyles_set_featured_image_from_candidate_photo( $resume_id, $values ){
	
	if( isset( $values['resume_fields'] ) ){
		
		$candidate_photo = isset( $values['resume_fields']['candidate_photo'] ) ? $values['resume_fields']['candidate_photo'] : false;
		
		if( empty( $candidate_photo ) && has_post_thumbnail( $resume_id ) ){
			delete_post_thumbnail( $resume_id );
			delete_post_meta( $resume_id, 'candidate_photo' );
		} elseif ( ! empty( $candidate_photo ) ) {
			$attach_id = get_attachment_id_from_url( $candidate_photo );
			if ( $attach_id !== get_post_thumbnail_id( $resume_id ) ) {
				set_post_thumbnail( $resume_id, $attach_id );
			}
		}
		
	}
	
}

add_filter( 'register_post_type_resume', 'register_post_type_resume_enable_featured_image' );

// Unfortunately all reusme uploads must be attached (added to media library) to support featured image
add_filter( 'resume_manager_attach_uploaded_files', '__return_true' );

function register_post_type_resume_enable_featured_image( $post_type ) {
	if( ! in_array( 'thumbnail', $post_type['supports'] ) ){
		$post_type['supports'][] = 'thumbnail';
	}
	return $post_type;
}