A simple DatabaseCleaner replacement that only support TRUNCATE and ActiveRecord. Had a hard time using original DatabaseCleaner with Rails 3.

database_cleaner.rb

module DatabaseCleaner
  def self.clean
    Array.new.tap do |cache|
      ActiveRecord::Base.descendants.each do |model|
        next if cache.include?(model.table_name)
        cache << model.table_name
        table_name = ActiveRecord::Base.connection.quote_table_name(model.table_name)
        ActiveRecord::Base.connection.execute "TRUNCATE TABLE #{table_name}"
      end
    end
  end
end