You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: pixel_methods.rb
    path of file: ./repos/pixela/lib/pixela/client
    
    the code of the file until where you have to start completion: module Pixela::Client::PixelMethods
  # It records the quantity of the specified date as a "Pixel".
  #
  # @param graph_id      [String]
  # @param date          [Date,Time]
  # @param quantity      [Integer,Float]
  # @param optional_data [Object] Ad
    
  def get_pixel(graph_id:, date: Date.today)
    res =
      with_error_handling do
        connection.get("users/#{username}/graphs/#{graph_id}/#{to_ymd(date)}").body
      end

    if res.key?(:optionalData)
      res[:optional_data] =
        begin
          JSON.parse(res[:optionalData])
        rescue JSON::ParserError
          res[:optionalData]
        end