I have an issue with running the rails console at heroku (cedar-stack). Each of the following commands heroku run console, heroku run rails console, heroku run bundle exec rails
If you have multiple environments (staging / production / etc) you need this command:
heroku run -a app-name console
If you only have a single environment and never setup staging or other environments you can just run:
heroku run console
https://github.com/nemrow/rails_app_cheatsheet/blob/master/heroku.rdoc