ruby_array.rb

require 'ostruct'
class House
  attr_accessor :doors
  def initialize(n = 3)
    @doors = Array.new(n, OpenStruct.new(color: 'dummy', name: 'dummy'))
  end
end

# won't work because ruby will *not* clone the object but use the same one
# 3 times.
h = House.new
puts h.doors[0].object_id # => 70357021610520
puts h.doors[1].object_id # => 70357021610520

# You need to manually create each one of them

class AnotherHouse
  attr_accessor :doors
  def initialize(n = 3)
    @doors = n.times.map{|door| OpenStruct.new(color: 'dummy', name: 'dummy')}
  end
end

h2 = AnotherHouse.new
puts h2.doors[0].object_id # => 70275299473840
puts h2.doors[1].object_id # => 70275299473200