Nested-Transactional Cukes in DataMapper

1_notes.txt

Depends on:

 - https://github.com/datamapper/do/commit/74645c46ac9b210c5e4029853b8a23fe02defd71 
 - https://github.com/datamapper/dm-transactions/commit/242e60473a341a151df62ea707264f06f418b077 

2_database_steps.rb

known_repositories = ::DataMapper::Model.descendants.map { |m| m.repository }.uniq

Before do 
  known_repositories.each do |r|
    t = r.transaction
    t.begin
    r.adapter.push_transaction(t) 
  end
end

After do
  known_repositories.each do |r|
    t = r.adapter.pop_transaction
    t.rollback
  end
end