code: public function buildContainsQuery($queryString)
      {
          $queryString = trim($queryString);
          if (empty($queryString)) {
              return [];
          }
          $modelClass = $this->modelClass;
          $queryTerms = $modelClass::prepareSearchTerms($queryString);
          $searchFields = $modelClass::parseSearchFields($modelClass::searchFields());
          $localSearchFieldsRaw = $searchFields['local'];
          $localSearchFields = [];
          foreach ($localSearchFieldsRaw as $fieldGroup) {
              $localSearchFields = array_merge($localSearchFields, $fieldGroup);
          }
          $method = 'single';
          if ($method === 'group') {
              $query = ['condition' => 'AND', 'rules' => []];
              foreach ($queryTerms as $queryTerm) {
                  $subquery = ['condition' => 'OR', 'rules' => []];
                  foreach ($localSearchFields as $searchField) {
                      $subquery['rules'][] = [
                          'field' => $searchField,
                          'operator' => 'contains',
                          'value' => $queryTerm,
                      ];
                  }
                  $query['rules'][] = $subquery;
              }
          } else {
              $query = ['condition' => 'OR', 'rules' => []];
              foreach ($queryTerms as $queryTerm) {
                  foreach ($localSearchFields as $searchField) {
                      $query['rules'][] = [
                          'field' => $searchField,
                          'operator' => 'contains',
                          'value' => $queryTerm,
                      ];
                  }
              }
          }
  
          return $query;
      }
docs: [[@doctodo method_description:buildContainsQuery]].
  
  @param [[@doctodo param_type:queryString]] $queryString [[@doctodo param_description:queryString]]
  
  @return [[@doctodo return_type:buildContainsQuery]] [[@doctodo return_description:buildContainsQuery]]