Get Nids from Views Results into another View passively

blog.module

//////////////////////////////////////////////////////////////////////
// Get Nids from Views Results into another View passively
//
// Problem with below code is caching
//   'featured_nids' may not get updated before views_pre_view
//   this will lead to an issue where the args set on 'blogs'
//   will always be lagging behind by 1 cache clear.

//hook_views_pre_view
function blog_views_pre_view(&$view, &$display_id, &$args){
  //dpm($view); dpm($display_id); dpm($args);
  if($view->name == 'blogs'){
    
    //get some nids to not show in the blog block
    $nids = variable_get('featured_nids', array());
    
    //append them as args
    $args = array_merge($args, $nids);
  }  
}

//hook_views_pre_render
function blog_views_pre_render(&$view){
  //if we're in this hook, something changed
  if($view->name == 'home_page_feature_rotator'){
    //grab nids 
    $view_cont = $view->result;
    $to_set = array();
    foreach( $view_cont as $res ){
      $to_set[] = $res->nid;
    }
    
    variable_set('featured_nids', $to_set);
  }
}