Rails 5.2 with master.key - Heroku deployment

Question

Rails 5.2 introduces the encrypted secrets feature through the usage of the awesome credentials.yml. But I'm struggling to get it to work with Heroku.

Is there any Strategy available right now to deploy a Rails 5.2 App to Heroku?

Answer 1

You should set the environment variable RAILS_MASTER_KEY, either on your heroku web dashboard, or using console:

$ heroku config:set RAILS_MASTER_KEY=<your-master-key> 

Example:

$ heroku config:set RAILS_MASTER_KEY=123456789 

(The < and > are placeholders)

Rails will detect this variable and use it as your master key (instead of looking for it in master.key file).