Duplicate comerce variations product in views. Need content:nid field!

my_module.module

/**
 * Implements hook_views_pre_execute().
 *
 * Rewrite SQL query to prevent duplicates based on NID
 */
function my_module_views_pre_execute(&$view)  {
  if ($view->name == '') {
    $query = $view->build_info['query'];
    $count_query = $view->build_info['count_query'];
    $query->groupBy('nid');
    $count_query->groupBy('nid');
  }
}