public function actionVocFlushTerms($voc_id)
 {
     $voc = SpecTermsVoc::findOne(['id' => $voc_id]);
     if (empty($voc)) {
         echo "Vocabulary with id {$voc_id} not exists\n";
         return;
     }
     $yes = $this->prompt("Are you sure you want to remove all terms from vocabulary {$voc->name} id: {$voc->id} ? Type 'yes' to proceed \n");
     if ($yes == 'yes') {
         SpecTerm::deleteAll(['vocabulary_id' => $voc_id]);
         echo "All terms for vocabulary id: {$voc_id} has been removed\n";
     }
 }