code: public function _currentTaxonomies()
      {
          if (is_null($this->_current_taxonomy_id)) {
              $taxonomyClass = Yii::$app->classes[$this->viaModelClass];
              $taxonomies = $taxonomyClass::find()->where([$this->relationKey => $this->owner->primaryKey])->select('taxonomy_id')->column();
              $this->_current_taxonomy_id = array_combine($taxonomies, $taxonomies);
          }
  
          return $this->_current_taxonomy_id;
      }
docs: [[@doctodo method_description:_currentTaxonomies]].
  
  @return [[@doctodo return_type:_currentTaxonomies]] [[@doctodo return_description:_currentTaxonomies]]