Rails 5.2 application secrets empty at Heroku

问题

I deployed to Heroku with success but there is an issue with credentials. I added RAILS_MASTER_KEY env variable at Heroku app CONFIG VARS section and copy-pasted the value from my app master.key file:

Then when I check its value from Heroku console, it is still nil:

Loading production environment (Rails 5.2.3)
irb(main):001:0> Rails.application.secrets.secret_key_base
=> nil
irb(main):002:0> Rails.application.secrets
=> {:secret_key_base=>nil, :secret_token=>nil}
irb(main):003:0> 

But when I check it other way:

ENV['RAILS_MASTER_KEY']
=> "sdfghjklm.......1a0befa6139"

it is displayed correctly.

What am I missing?

回答1:

I figured out myself, - I followed a Pluralsight tutorial on Rails API and it used the old way to get Rails secrets:

Rails.application.secrets.secret_key_base

Starting from Rails 5.2 there is no more secrets.yml file and the right way to get the env variables saved in credential.yml.encis as follows:

Rails.application.credentials.dig(:secret_key_base)

After updating the corresponding code, everything works as needed. Hope this helps.

来源：https://stackoverflow.com/questions/56889272/rails-5-2-application-secrets-empty-at-heroku