code: public function getDataSource()
      {
          if (is_null($this->_dataSource)) {
              $typeItem = Yii::$app->collectors['types']->getOne($this->instructions['type']);
              if (!$typeItem || !($type = $typeItem->object)) {
                  return $this->_dataSource = false;
              }
              $primaryModel = $type->primaryModel;
              if (isset($this->instructions['parent'])) {
                  $registryClass = Yii::$app->classes['Registry'];
                  $object = $registryClass::getObject($this->instructions['parent']);
                  if (!$object) {
                      return $this->_dataSource = false;
                  }
                  $this->_dataSource = $object->queryChildObjects($primaryModel, [], []);
              } else {
                  $this->_dataSource = $primaryModel::find();
              }
              $dummyModel = new $primaryModel();
              $sortOptions = array_values($dummyModel->sortOptions);
              if ($this->filterQuery) {
                  $primaryModel::simpleSearchTermQuery($this->_dataSource, $this->filterQuery);
              } elseif (isset($sortOptions[0])) {
                  $this->_dataSource->orderBy($sortOptions[0]);
              }
          }
  
          return $this->_dataSource;
      }
docs: Get data source.
  
  @return [[@doctodo return_type:getDataSource]] [[@doctodo return_description:getDataSource]]