How to write a Rails Service Object with logging

service_object.rb

# # A Plain Old Ruby Object (poro) with Rails logger support:
class ServiceObject
  def initialize(foo)
    @logger = Logger.new(STDOUT)
    @foo = foo
  end

  def call
    do_something
  end

  private
  
  def do_something
    @logger.debug { "do_something called on #{@foo.class}" }
  end
end

class Bar
end

# # Usage example:
MyService.new(Bar.new).call
#=> [2018-01-27] DEBUG -- : do_something called! With Bar