public function fieldExists($field): bool
    {
        return $this->redis->hexists($this->key, $field) === self::RESPONSE_SUCCESS;
    }
public function fieldExists($field): bool
    {
        return $this->redis->hexists($this->key, $field) === self::RESPONSE_SUCCESS;
    }
@param int|string $field A field to look out for.

@return bool True if it exists in this hash. False otherwise.