Extract Logic to a Separate Class - Rails

extract_logic.rb

# I have the following classes in my project

class CustomReport < ActiveRecord::Base
  def foo
    print 'hello'
  end
end

class CustomReportService
  def bar
    print 'foobar'
  end
  
  def lorem
    print 'lorem ipsum'
  end
end

# I have the following code written at many places throughout my project but this code doesn't work.
# I don't want to change the following code because this will require changes at too many places.
# I am allowed to change the above implementaion to make the following code work.
# What can I change above?
# You can suggest as many ways as possible to achieve this behaviour.
# ASSUME THAT THIS CODE IS WRITTEN IN A RAILS 4.0+ project.

cr = CustomReport.new
cr.foo # => hello
cr.bar # => foobar
cr.lorem # => lorem ipsum

module CustomReportService
Include this module in custom report model.