gistfile1.rb

class Container < Ohm::Model
  attribute :name
  list :feeds, Feed
end

class Feed < Ohm::Model
  attribute :title
end

c = Container.create(:name => 'Uno')
#<Container:1 name="Uno" feeds=#<List (Feed): []> bars=#<Set (Feed): []>>

c.feeds.unshift Feed.create(:title => 'A')
#=> 1
c.feeds.unshift Feed.create(:title => 'B')
#=> 2
c.feeds.unshift Feed.create(:title => 'C')
#=> 3
c.feeds.key.lrange(0, -1)
#=> ["3", "2", "1"]

c.feeds
#=> #<List (Feed): ["3", "2", "1"]>

c.feeds[0]
#=> nil

c.feeds.all
#=> [#<Feed:3 title="C">, #<Feed:2 title="B">, #<Feed:1 title="A">]