class A < ActiveRecord::Base
 def foo
  puts "foo"
 end
end

class B < ActiveRecord::Base
 def foo
  puts "foo"
 end
end

class Base < ActiveRecord::Base
 def foo
  puts "foo"
 end
end

class A < Base
end

class B < Base
end

Module Base
 def foo
  puts "foo"
 end
end

class A < ActiveRecord::Base
 include Base
end

class B < ActiveRecord::Base
 include Base
end

class Base < ActiveRecord::Base
  def foo
    puts "foo"
  end
end

class A < Base
end

class B < Base
end

Module Base
  def foo
  puts "foo"
 end
end

class A < ActiveRecord::Base
 include Base
end

class B < ActiveRecord::Base
 include Base
end