Menu that conditionally shows webform, or edit previous submission

Question

How can I have a menu item "RSVP" that shows a webform, but after an authenticated user has submitted that webform, clicking on "RSVP" would now bring them back to their submission in edit mode?

rsvpdirect.info:

name = rsvpdirect
description = "Redirects webform nodes to edit if the user has already submitted it once before."
package = Custom
core = 7.x
files[] = rsvpdirect.module

rsvpdirect.module:

<?php

/**
* @file
* Forces redirect of webform node to edit the user's previous submission.
*
*/

/**
* Implementation of hook_node_view()
*/
function rsvpdirect_node_view($node, $view_mode, $langcode) {
  global $user;
  if ($node->type == 'webform' && $view_mode == 'full' && arg(0) == 'node') {
    $submissions = webform_get_submissions(array('nid' => $node->nid, 'uid' => $user->uid));
    $submission_count = webform_get_submission_count($node->nid, $user->uid);

 if ($submission_count >= 1) {
      // Get first submission
      $submission = reset($submissions);
      drupal_goto('node/' . $node->nid . '/submission/' . $submission->sid . '/edit');
    }
  }
}

Answer 1

You can do it using hook_node_view and redirect functionality to redirect if webform is submitted. Your menu link always point to webform page.

function YOURMODULENAME_node_view($node, $view_mode, $langcode) {
  global $user;
  if ($node->type == 'webform' && $view_mode == 'full' && arg(0) == 'node') {
    $submissions = webform_get_submissions(array('nid' => $node->nid, 'uid' => $user->uid));
    $submission_count = webform_get_submission_count($node->nid, $user->uid);
    if ($submission_count >= 1) {
      // Get first submission
      $submission = reset($submissions);
      drupal_goto('node/' . $node->nid . '/submission/' . $submission->sid . '/edit');
    }
  }
}