# File lib/state_machine/integrations/mongo_mapper/versions.rb, line 81
        def self.active?
          # Only 0.8.x and up has a Version string available, so Plugins is used
          # to detect when 0.7.x is active
          defined?(::MongoMapper::Plugins) && (!defined?(::MongoMapper::Version) || ::MongoMapper::Version <= '0.8.3')
        end