shows what happens to the ancestry if a class - and the super classes

include-vs-prepend.rb

require "pry-byebug"

module ToBeIncluded
end

module ToBePrepended
end

class Super
end

class SuperIncluded
  include ToBeIncluded
end

class SuperPrepended
  prepend ToBePrepended
end

class A
  include ToBeIncluded
end

class B
  prepend ToBePrepended
end

class SubA < Super
  include ToBeIncluded
end

class SubB < Super
  prepend ToBePrepended
  include ToBeIncluded
end

class SubC < SuperIncluded
  prepend ToBePrepended
end

class SubD < SuperPrepended
  include ToBeIncluded
end


binding.pry
puts "debug!"
# use .ancestors

# [1] pry(main)>  A.ancestors
# => [A, ToBeIncluded, Object, PP::ObjectMixin, Kernel, BasicObject]
# [2] pry(main)> B.ancestors
# => [ToBePrepended, B, Object, PP::ObjectMixin, Kernel, BasicObject]
# [3] pry(main)> Sub.ancestors
# NameError: uninitialized constant Sub
# from (pry):3:in `<main>'
# [4] pry(main)> SubA.ancestors
# => [SubA, ToBeIncluded, Super, Object, PP::ObjectMixin, Kernel, BasicObject]
# [5] pry(main)> SubB.ancestors
# => [ToBePrepended, SubB, ToBeIncluded, Super, Object, PP::ObjectMixin, Kernel, BasicObject]
# [6] pry(main)> SubC.ancestors
# => [ToBePrepended, SubC, SuperIncluded, ToBeIncluded, Object, PP::ObjectMixin, Kernel, BasicObject]
# [7] pry(main)> SubD.ancestors
# => [SubD, ToBeIncluded, ToBePrepended, SuperPrepended, Object, PP::ObjectMixin, Kernel, BasicObject]