Wordpress Updating Attachment Data - wordpress

Question

I'm attempting to add a feature to a plugin that extends media management. This feature would allow you to rename an attachment file. I've been able to complete this with the following code.
public function update_attachment_filename( $post_ID ) {
// Get path to existing file
$file = get_attached_file( $post_ID );
$path = pathinfo( $file );
// Generate new file name
$file_updated = $path['dirname'] . '/' . $_POST['update_filename'] . '.' . $path['extension'];
// Update the name and reference to file
rename( $file, $file_updated );
update_attached_file( $post_ID, $file_updated );
}
While the original file gets renamed using the above method, all additional image sizes defined in the plugins/theme are not updated. I'm struggling to figure out the best way to accomplish this task.
I've looked into wp_update_attachment_metadata() and wp_generate_attachment_metadata() but am unsure whether they will give me the desired functionality.
Additionally I've looked into something such as:
$file_meta = wp_get_attachment_metadata( $post_ID );
foreach( $file_meta['sizes'] as $image ) {
// Do something
}
Any nudge in the right direction would be greatly appreciated.
Thanks!

Answer 1

I was able to utilize both the wp_generate_attachment_metadata() and the wp_update_attachment_metadata() function to achieve the desired end result.
public function update_attachment_filename( $post_ID ) {
if( isset( $_POST['update_filename'] ) && ! empty( $_POST['update_filename'] ) ) {
// Get path to existing attachment
$file = get_attached_file( $post_ID );
$path = pathinfo( $file );
// Create new attachment name
$file_updated = $path['dirname'] . '/' . $_POST['update_filename'] . '.' . $path['extension'];
// Update the attachment name
rename( $file, $file_updated );
update_attached_file( $post_ID, $file_updated );
// Update attachment meta data
$file_updated_meta = wp_generate_attachment_metadata( $post_ID, $file_updated );
wp_update_attachment_metadata( $post_ID, $file_updated_meta );
}
}