/**
  * Edit (or add) database page
  */
 public function assignDatabasesAction()
 {
     $category_id = $this->request->requireParam('category', 'Request did not include category id');
     $subcategory_id = $this->request->requireParam('subcategory', 'Request did not include subcategory id');
     $databases = $this->request->getParam('database', null, true);
     $subcategory = $this->knowledgebase->getSubcategoryById($subcategory_id);
     foreach ($databases as $database) {
         $database_object = $this->knowledgebase->getDatabase($database);
         $sequence = new DatabaseSequence();
         $sequence->setDatabase($database_object);
         $subcategory->addDatabaseSequence($sequence);
     }
     $this->knowledgebase->update($subcategory);
     $params = array('controller' => $this->request->getParam('controller'), 'action' => 'subject', 'id' => $category_id);
     return $this->redirectTo($params);
 }