After many hours of trial and error and much frustration, I was able to figure this out. Here’s the code that worked for me to retrieve the correct ID so that I could use a variable in the rewritten file name:
function process_upload_prefilter() {
// WP Handle Upload Prefilter:
add_filter('wp_handle_upload_prefilter', 'rename_acf_upload', 11, 1);
}
function rename_acf_upload( $file ) {
$current_post_id = $_REQUEST['post_id']; // FINALLY RETRIEVED THE ID SUCCESSFULLY!!!
$company_name = get_field('company_name', $current_post_id);
$file['name'] = $company_name . '-C.pdf';
return $file;
}
// ACF Upload Prefilter: (report_link is the name of the field that I want to do the upload prefiltering on)
add_filter('acf/upload_prefilter/name=report_link', 'process_upload_prefilter' );
Hope it helps someone else save some time in the future.
Best,
Jack
Thanks for sharing your code.
I may be mistaken, but I believe that I can add a simplification to ituk’s post. If you just want the first item in the repeater, you can target it with the [0] array index without needing to reset the repeater field. So the following chunk of ituk’s code:
$repeater_field = $_POST['acf']['field_57bc841e7f973']; //repater parent key
reset($repeater_field); //reset repeater array to the rist row
$first_field = key($repeater_field); //get first key in the repeater array
$my_text_field = $_POST['acf']['field_57bc841e7f973'][$first_field]['field_57bc8a5447d06']; //specific field
can be simplified to this:
$my_text_field = $_POST['acf']['field_57bc841e7f973'][0]['field_57bc8a5447d06']; //specific field
NOTE: This only works for the 1st item! It seems that the first item uses the [0] array index but each repeater subfield that gets added gets a randomly generated array index. So instead of going to [1] for the second item it will be something like [58b641f67f3de], which is a randomly generated string that is probably generated from the server’s timestamp.
