I’ve read the Capybara readme at https://github.com/jnicklas/capybara and it solved my issue.
Transactional fixtures only work in the default Rack::Test driver, but
not for other drivers like Selenium. Cucumber takes care of this
automatically, but with Test::Unit or RSpec, you may have to use the
database_cleaner gem. See this explanation (and code for solution 2
and solution 3) for details.
But basically its a threading issue that involves Capybara having its own thread when running the non-Rack driver, that makes the transactional fixtures feature to use a second connection in another context. So the driver thread is never in the same context of the running rspec.
Luckily this can be easily solve (at least it solved for me) doing a dynamic switching in th DatabaseCleaner strategy to use:
RSpec.configure do |config|
config.use_transactional_fixtures = false
config.before :each do
if Capybara.current_driver == :rack_test
DatabaseCleaner.strategy = :transaction
else
DatabaseCleaner.strategy = :truncation
end
DatabaseCleaner.start
end
config.after do
DatabaseCleaner.clean
end
end