nf_fu_reconnect_uploads_with_submissions.php

<?php
/**
 * Plugin Name: Ninja Forms Uploads Connect Submissions
 * Plugin URI: https://ninjaforms.com/extensions/file-uploads/
 * Description: Debug plugin
 * Version: 3.0
 * Author: polevaultweb
 * Author URI: https://polevaultweb.com
 */


add_action( 'admin_init', function () {
	if ( ! isset( $_GET['nf_fu_connect_submissions'] ) ) {
		return;
	}

	$dry_run = false;
	if ( isset( $_GET['dry-run'] ) ) {
		$dry_run = true;
	}

	$where = "WHERE `data` NOT LIKE '%sub_id%'";
	$uploads = NF_File_Uploads()->model->fetch( $where );

	global $wpdb;

	if ( $dry_run ) {
		print 'NF Connect Submissions - Total: '. count( $uploads );
	}

	foreach ( $uploads as $upload ) {
		$data = maybe_unserialize( $upload['data'] );

		$url = $data['file_url'];

		$query = "
			SELECT p.ID, p.post_date, pm1.meta_value as form_id 
			FROM $wpdb->posts p 
				INNER JOIN $wpdb->postmeta pm
				ON p.ID = pm.post_id 
					INNER JOIN $wpdb->postmeta pm1
					ON p.ID = pm1.post_id
					AND pm1.meta_key = '_form_id'
			WHERE pm.meta_value LIKE '%%%s%%'";
		$posts = $wpdb->get_results( $wpdb->prepare( $query, $url ) );

		if ( count( $posts ) == 1 && $posts[0]->form_id == $upload['form_id'] ) {
			if ( $dry_run ) {
				print 'NF Connect Submissions - File URL: ' . $url;
				print 'NF Connect Submissions - Found Sub: ' . $posts[0]->ID;
			} else {
				$data['sub_id'] = $posts[0]->ID;

				NF_File_Uploads()->model->update( $upload['id'], $data );
			}
		}
	}
} );