code: func (c *Client) ReadingById(id string) (reading contract.Reading, err error) {
  	conn := c.Pool.Get()
  	defer conn.Close()
  
  	err = getObjectById(conn, id, unmarshalObject, &reading)
  	if err != nil {
  		if err == redis.ErrNil {
  			return reading, db.ErrNotFound
  		}
  		return reading, err
  	}
  
  	return reading, nil
  }
docs: // Get a reading by ID