Allow using submission id in submission title format #143

Author: luizbills

classes/class-cpt-wplf-form.php

@@ -598,6 +598,8 @@ public function meta_box_title_format( $post ) {
 ?>
 <p><?php esc_html_e( 'Submissions from this form will use this formatting in their title.', 'wp-libre-form' ); ?></p>
 <p><?php esc_html_e( 'You may use any field values enclosed in "%" markers.', 'wp-libre-form' ); ?></p>
+<?php // translators: %submission-id% is not meant to be translated  ?>
+<p><?php esc_html_e( 'In addition, you may use %submission-id%.', 'wp-libre-form' ); ?></p>
 <p>
   <input
     type="text"

inc/wplf-ajax.php

@@ -32,6 +32,17 @@ function wplf_ajax_submit_handler() {
     // the title is the value of whatever the first field was in the form
     $title_format = get_post_meta( $form->ID, '_wplf_title_format', true );
 
+    // create submission post
+    $post_id = wp_insert_post( array(
+      'post_title'     => '',
+      'post_status'    => 'publish',
+      'post_type'      => 'wplf-submission',
+    ) );
+
+    // exposes $post_id in $_POST to be able to use in the title
+    // hacky, but uses less memory than a copy of $_POST
+    $_POST['submission-id'] = $post_id;
+
     // substitute the %..% tags with field values
     $post_title = $title_format;
 
@@ -44,12 +55,14 @@ function wplf_ajax_submit_handler() {
       $post_title = preg_replace( '/%.+?%/', $replace, $post_title, 1 );
     }
 
-    // create submission post
-    $post_id = wp_insert_post( array(
-      'post_title'     => $post_title,
-      'post_status'    => 'publish',
-      'post_type'      => 'wplf-submission',
-    ) );
+    // save the title
+    wp_update_post( [
+      'ID'         => $post_id,
+      'post_title' => $post_title,
+    ] );
+
+    // don't save the post id in meta
+    unset( $_POST['submission-id'] );
 
     // add submission data as meta values
     foreach ( $_POST as $key => $value ) {