Rails4 Upgrade: Devise Upgrade

Rails 3 was using Devise 2.x.x and Rails 4 needed 3.x.x .

We did the change as needed and started getting weird issue of

TypeError: [125] is not a symbol


/gems/activesupport-3.2.16/lib/active_support/inflector/methods.rb:230 in const_defined?
/gems/activesupport-3.2.16/lib/active_support/inflector/methods.rb:230 in block in constantize
/gems/activesupport-3.2.16/lib/active_support/inflector/methods.rb:229 in each
/gems/activesupport-3.2.16/lib/active_support/inflector/methods.rb:229 in constantize
/gems/devise-2.2.3/lib/devise/rails/warden_compat.rb:27 in deserialize
/gems/warden-1.2.3/lib/warden/session_serializer.rb:34 in fetch

On further inspection, we found that the key warden.user.user.key


"warden.user.user.key": "[[\"125\"], \"qfdfiyyfLsPGruC7oNfX\"]"


"warden.user.user.key": "[\"User"\, [\"125\"], \"qfdfiyyfLsPGruC7oNfX\"]"

is an array which had User as first element and now is an integer i.e. user_id

Only way to resolve we found was to logout all users which is piece of cake, Thanks to Rails

  • Generate a new secret key
    • bundle exec rake secret
  • Change the secret_token in config/initializers/secret_token.rb
    • Rails::Application.config.secret_token = 'TOKEN'

Enjoy Rails 4 !!!

Written on September 7, 2015