ModelBundle/Repository/ContentRepository.php
public function findOneByLanguageAndVersion($contentId, $language, $version = null)
    {
        $qa = $this->createAggregationQueryWithContentIdAndLanguageAndVersion($contentId, $language, $version);

        return $this->singleHydrateAggregateQuery($qa);
    }
public function findOneByLanguageAndVersion($contentId, $language, $version = null)
    {
        $qa = $this->createAggregationQueryWithContentIdAndLanguageAndVersion($contentId, $language, $version);

        return $this->singleHydrateAggregateQuery($qa);
    }
@param string      $contentId
@param string      $language
@param string|null $version

@return ContentInterface|null