isValidEntry() - Validate entry belongs to category?

Lets say I've got the url /blog/:category/:entry/, is there anyway using isValidEntry() to validate that the entry is assigned to the category?

[rsanchez]

You can't with isValidEntry, but you can with a custom query:

$config['resource_router'] = array(
  'blog/:category/:entry' => function($router, $wildcard1, $wildcard2) {
    if (! $wildcard2->isValidEntry()) {
      return $router->set404();
    }

    $isValidCategory = ee()->db->where('entry_id', $wildcard2->value)
      ->where('cat_url_title', $wildcard1->value)
      ->join('categories', 'categories.cat_id = category_posts.cat_id')
      ->count_all_results('category_posts') > 0;

    if (! $isValidCategory) {
      return $router->set404();
    }

    $router->setTemplate('blog/_entry');
  },
);

Thanks that looks good to me, although is there a way to url_title's instead? I tried changing it to...

$isValidCategory = ee()->db->where('url_title', $wildcard_2->value)
    ->where('cat_url_title', $wildcard_1->value)
    ->join('categories', 'categories.cat_url_title = category_posts.cat_url_title')
    ->count_all_results('category_posts') > 0;

And I'm getting the error:

SQLSTATE[42S22]: Column not found: 1054 Unknown column 'url_title' in 'where clause':
SELECT COUNT(*) AS `numrows` FROM (`exp_category_posts`) JOIN `exp_categories` ON
`exp_categories`.`cat_url_title` = `exp_category_posts`.`cat_url_title` 
WHERE `url_title` = 'london-pbfa-shubiz' AND `cat_url_title` = 'european-footwear-accessories-gifts'