user classes example

example.rb

class User

  attr_accessor :classes

  def initialize
    @classes = []
  end

  def add_class(klass)
    @classes << klass
  end

  def do_something_with_classes
    @classes.each { |klass| puts klass.to_s }
  end
end

class Klass
  def initialize(name)
    @name = name
  end

  def to_s
    @name
  end
end

abed_nadir = User.new
abed_nadir.add_class(Klass.new("History of Ice Cream"))
abed_nadir.do_something_with_classes
# => History of Ice Cream