Rails 5 cipher.key "key must be 32 bytes" error

Question

Brand new Rails application.

Rails version 5.0.0.1, Ruby version 2.4.0preview2.

Create application "demo", run a simple scaffold generate Product, and get an error when trying to view the scaffold's overview page (base index file still loads the Welcome to Rails screen fine):

ArgumentError in ProductsController#index key must be 32 bytes:

  cipher = new_cipher
  cipher.encrypt
  cipher.key = @secret

  # Rely on OpenSSL for the initialization vector
  iv = cipher.random_iv

The problem line is apparently cipher.key = @secret.

I've seen various mentions on the github repo for Rails mentioning this issue, but all implied it was now resolved in Rails 5.0.0.1

Answer 1

Ok, there was a slight misunderstanding on my part, looks like the fix is coming in 5.0.1 not 5.0.0.1

https://github.com/rails/rails/issues/26694