Do custom post type attachments store the parent post ID, and if so, how do I retrieve it.
I am using a form which allows registered users to create a CPT (‘Paper’) and upload a pdf or Word document (via an ACF upload field).
All this is working fine, and the documents are being saved in a custom folder in wp_content/uploads/papers
However, I need to prepend the ID of the created CPT post to the uploaded file name, eg 123-my-file-name.pdf
I do have this question posted on WordPress.org forum and someone is kindly helping me there, but first I need to establish that what I’m doing is actually possible in WordPress. I’m amazed I haven’t found any snippet for this.
For those interested, this is my current code in functions.php which results in nothing being added to the front of the file name.
add_filter( 'wp_handle_upload_prefilter', 'custom_upload_filter' );
function custom_upload_filter($file) {
// Get the parent post ID, if there is one
if( isset($_REQUEST['p']) ) {
$post_id = $_REQUEST['p'];
} else {
$post_id = false;
}
$file['name'] = $post_id . '-' . $file['name'];
return $file;
}
I’m sorry if I’m breaking protocol by posting here as well. But if I can establish that getting the CPT post id is possible at the point of creating the post and uploading file I can at least continue trying to get the code to work.
Cheers,
Tracy
