lib/Yucca/Model/ModelAbstract.php
public function setYuccaIdentifier($identifier, $shardingKey = null)
    {
        $this->yuccaIdentifier = $identifier;
        $this->yuccaShardingKey = $shardingKey;

        return $this;
    }
public function setYuccaIdentifier($identifier, $shardingKey = null)
    {
        $this->yuccaIdentifier = $identifier;
        $this->yuccaShardingKey = $shardingKey;

        return $this;
    }
@param mixed $identifier
@param null  $shardingKey

@return $this