database_cleaner/examples/lib/activerecord_models.rb

require 'active_record'

ActiveRecord::Base.establish_connection(:adapter => "#{"jdbc" if defined?(JRUBY_VERSION)}sqlite3", :database => ":memory:")

ActiveRecord::Schema.define(:version => 1) do
  create_table :widgets do |t|
    t.string :name
  end
  
  create_table :another_widgets do |t|
    t.string :name
  end
end

unless defined? Widget
  class Widget < ActiveRecord::Base
  end
else
  class AnotherWidget < ActiveRecord::Base
  end  
end