play_song.rb

play_song.rb

class PlaySong
  def initialize(song)
    @song = song
  end

  def call
    # Here you implement your service object
    "🎶 #{song}"
  end

  private

  attr_reader :song

  # Defining a singleton method call
  # Making it easy to call our class without instantiating it
  class << self
    def call(song)
      new(song).call
    end
  end
end

# Here's the final interface for our service Object
PlaySong.("Call me Maybe") # => "🎶 Call me Maybe"

# Cool, huh? 😎