feature_errors

superclass mismatch for class PostgreSQLAdapter (TypeError)
  .bundle/ruby/1.8/bundler/gems/rails-master/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb:189
  .bundle/ruby/1.8/bundler/gems/rails-master/activesupport/lib/active_support/dependencies.rb:209:in `require'
  .bundle/ruby/1.8/bundler/gems/rails-master/activesupport/lib/active_support/dependencies.rb:209:in `require'
  .bundle/ruby/1.8/bundler/gems/rails-master/activesupport/lib/active_support/dependencies.rb:197:in `load_dependency'
  .bundle/ruby/1.8/bundler/gems/rails-master/activesupport/lib/active_support/dependencies.rb:209:in `require'
  .bundle/ruby/1.8/bundler/gems/rails-master/activerecord/lib/active_record/connection_adapters/abstract/connection_specification.rb:74:in `establish_connection'
  .bundle/ruby/1.8/bundler/gems/rails-master/activerecord/lib/active_record/connection_adapters/abstract/connection_specification.rb:60:in `establish_connection'
  .bundle/ruby/1.8/bundler/gems/rails-master/activerecord/lib/active_record/connection_adapters/abstract/connection_specification.rb:55:in `establish_connection'
  .bundle/ruby/1.8/bundler/gems/rails-master/activerecord/lib/active_record/railtie.rb:50
  .bundle/ruby/1.8/bundler/gems/rails-master/activesupport/lib/active_support/lazy_load_hooks.rb:21:in `instance_eval'
  .bundle/ruby/1.8/bundler/gems/rails-master/activesupport/lib/active_support/lazy_load_hooks.rb:21:in `run_base_hooks'
  .bundle/ruby/1.8/bundler/gems/rails-master/activesupport/lib/active_support/lazy_load_hooks.rb:21:in `each'
  .bundle/ruby/1.8/bundler/gems/rails-master/activesupport/lib/active_support/lazy_load_hooks.rb:21:in `run_base_hooks'
  .bundle/ruby/1.8/bundler/gems/rails-master/activerecord/lib/active_record/base.rb:2248
  .bundle/ruby/1.8/bundler/gems/rails-master/activerecord/lib/active_record/fixtures.rb:911:in `setup_fixtures'
  .bundle/ruby/1.8/bundler/gems/rails-master/activesupport/lib/active_support/callbacks.rb:408:in `_run_setup_callbacks'
  .bundle/ruby/1.8/bundler/gems/rails-master/activesupport/lib/active_support/callbacks.rb:88:in `send'
  .bundle/ruby/1.8/bundler/gems/rails-master/activesupport/lib/active_support/callbacks.rb:88:in `Before'
    When I am on the scope inputs index page # features/step_definitions/web_steps.rb:18
    Then I should see "scope_inputs"         # features/step_definitions/web_steps.rb:99
      ActiveRecord::ConnectionNotEstablished (ActiveRecord::ConnectionNotEstablished)
      .bundle/ruby/1.8/bundler/gems/rails-master/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:330:in `retrieve_connection'
      .bundle/ruby/1.8/bundler/gems/rails-master/activerecord/lib/active_record/connection_adapters/abstract/connection_specification.rb:103:in `retrieve_connection'
      .bundle/ruby/1.8/bundler/gems/rails-master/activerecord/lib/active_record/connection_adapters/abstract/connection_specification.rb:95:in `connection'
      .bundle/ruby/1.8/bundler/gems/rails-master/activerecord/lib/active_record/fixtures.rb:950:in `teardown_fixtures'
      .bundle/ruby/1.8/bundler/gems/rails-master/activesupport/lib/active_support/callbacks.rb:408:in `_run_teardown_callbacks'
      .bundle/ruby/1.8/bundler/gems/rails-master/activesupport/lib/active_support/callbacks.rb:88:in `send'
      .bundle/ruby/1.8/bundler/gems/rails-master/activesupport/lib/active_support/callbacks.rb:88:in `After'

I tried the below but it didn't work:

gem 'database_cleaner', :require => false

In spec_helper.rb:

require 'database_cleaner'

I'm not using pg, only mysql.

In the end I reverted to 0.5.0, which works for me.