Elite Frontier

The latest declarative_authorization uses requires the use Ruby 1.8.7 and is incompatible with the Heroku Aspen stack, therefore if you are on the Aspen stack, you must migrate to the Bamboo stack that has Ruby 1.8.7.

After you have migrated to the Bamboo stack, you will find that your Heroku app will not start, this is because incompatible gems have been pulled in, which conflict with Rack 1.1.0, when Heroku adds the declarative_authorization gem.

To prevent pulling in the incompatible gems, specify in the .gems file:

declarative_authorization --ignore-dependencies

For more details: http://docs.heroku.com/rails236