Can’t access post meta on new post creation (cpt)

Question

I found out that actually, in a new Post creation, the Post Meta is not actually available yet! I was trying to get something that wasn’t available!

Check – How to access the post meta of a post that has just been published? …. which says … “when you publish the post and ‘publish_post’ is called, the post meta is not yet saved in the database”.

Thanks to Nicolai, I used $_Post[FormFeild] to get the required details!

This is my working code, line 6 ($the_book_ID = $_POST['input_2'];) got everything working!

function on_CPT_request_publish( $ID, $post ) {
  // ----------------- Start of Function -----------------
  // -------------------- Grab details to work with -----------------------

  // Get book ID
  $the_book_ID = $_POST['input_2'];

  // Get reviewer count
  $the_requested_reviews = $_POST['input_16']; 
  // Grab the number before the pipe for e.g. 3|69 would = 3
  $vars = explode('|', $the_requested_reviews);
  $the_requested_reviews = $vars[0];  


  // Get Book details
  $post_book_details = get_post( $the_book_ID ); 
  $book_title = $post_book_details->post_title; 
  $the_book_genre_ID = get_post_meta($the_book_ID,'book_genre',true);
  $theBookAuthor = $post_book_details->post_author;

  // ----------------- Find users -------------------

  // WP_User_Query arguments
  $args = array (
    'number'      => $the_requested_reviews,
    'count_total'     => true,
    'role'          => 'Subscriber',
    'order'         => 'ASC',
    'orderby'       => 'user_registered',
    'meta_query' => array(
      'relation' => 'AND',
      array(
        'key'     => 'user_book_genres',
        'value'   => $the_book_genre_ID,
        'compare' => '='
      ),
      array(
        'key'     => 'user_type',
        'value'   => 'Reviewer',
        'compare' => '='
      ),
      array(
        'key'     => 'user_credits',
        'value'   => '1',
        'compare' => '>='
      )
    )
  );  

  // Create the WP_User_Query object
  $wp_user_query = new WP_User_Query( $args );

  // Get the results
  $ARCusers = $wp_user_query->get_results();

  // Check for results
  if ( ! empty( $ARCusers ) ) {

    // loop through each author
    foreach ( $ARCusers as $ARCuser ) { 

      //Do the magic!

      // get all the user's data
      $ReviewAuthorID = $ARCuser->ID;

      //https://wordpress.stackexchange.com/questions/106973/wp-insert-post-or-similar-for-custom-post-type
      $review_post_id = wp_insert_post(array (
      'post_type' => 'review',
      'post_title' => 'Review of book - ' . $book_title . ' - ' . $ReviewAuthorID,
      'post_author' => $ReviewAuthorID,
      'post_status' => 'publish',
      'comment_status' => 'closed',   // if you prefer
      'ping_status' => 'closed',      // if you prefer
      ));

      if ($review_post_id) {
        // insert post meta
        add_post_meta($review_post_id, 'review_book_id', $the_book_ID);
        add_post_meta($review_post_id, 'book_author_id', $theBookAuthor);
      }

    }
  }
  // ----------------- End of Function -----------------
}
add_action(  'publish_request',  'on_CPT_request_publish', 10, 2 );

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