```ruby
module PackRat
  module Extensions
    module ActiveRecord
      def included(base)
        base.extend(ClassMethods)
      end
  
      module ClassMethods
        def inherited(child_class)
          child_class.send(:include, PackRat::CacheHelper)
          super
        end
      end

    end
  end
end

if defined? ActiveRecord::Base
#ActiveSupport.on_load :active_record do
  ActiveRecord::Base.send(:include, PackRat::Extensions::ActiveRecord)
#  include PackRat::Extensions::ActiveRecord
end```

Fix issues properly loading AR extension; Added lazy loading if ActiveSupport is available.
user
```ruby
module PackRat
  module Extensions
    module ActiveRecord
      def inherited(child_class)
        child_class.send(:include, PackRat::CacheHelper)
        super
      end
    end
  end
end

# Lazy load AR Extension into AR if ActiveSupport is there
if defined? ActiveSupport
  ActiveSupport.on_load :active_record do
    extend PackRat::Extensions::ActiveRecord
  end
else
  # Load immediately if no ActiveSupport loaded
  ActiveRecord::Base.send(:extend, PackRat::Extensions::ActiveRecord) if defined? ActiveRecord::Base
end```
assistant