Blog / Uninitialized constant ActionDispatch::Session::EncryptedCookieStore

Uninitialized constant ActionDispatch::Session::EncryptedCookieStore

Chris Oliver

May 3, 2013

Playing with a new Rails 4.0 application the other day was great fun. Today I upgraded to the latest release, Rails 4.0.0.rc1 and got the following error:

NameError: uninitialized constant ActionDispatch::Session::EncryptedCookieStore
~/.rvm/gems/ruby-1.9.3-p194/gems/railties-4.0.0.rc1/lib/rails/application/configuration.rb:144:in `const_get'
~/.rvm/gems/ruby-1.9.3-p194/gems/railties-4.0.0.rc1/lib/rails/application/configuration.rb:144:in `session_store'
~/.rvm/gems/ruby-1.9.3-p194/gems/railties-4.0.0.rc1/lib/rails/application.rb:345:in `block in default_middleware_stack'
~/.rvm/gems/ruby-1.9.3-p194/gems/railties-4.0.0.rc1/lib/rails/application.rb:307:in `tap'
~/.rvm/gems/ruby-1.9.3-p194/gems/railties-4.0.0.rc1/lib/rails/application.rb:307:in `default_middleware_stack'

As it turns out, the Rails 4 has changed the name of the session store to CookieStore which will automatically handle the encryption. The commit message for this change provides some insight as to how it's changed:

Automatically configure cookie-based sessions to be encrypted if
`secret_key_base` is set, falling back to signed if only `secret_token`
is set. Automatically upgrade existing signed cookie-based sessions from
Rails 3.x to be encrypted if both `secret_key_base` and `secret_token`
are set, or signed with the new key generator if only `secret_token` is
set. This leaves only the `config.session_store :cookie_store` option and
removes the two new options introduced in 4.0.0.beta1:
`encrypted_cookie_store` and `upgrade_signature_to_encryption_cookie_store`.

Fixing Uninitialized constant ActionDispatch::Session::EncryptedCookieStore

Open up your config/initializers/session_store.rb file and change :encrypted_session_store to :session_store like so:

#MyApp::Application.config.session_store :encrypted_cookie_store, key: '_myapp_session'
# to
MyApp::Application.config.session_store :cookie_store, key: '_myapp_session'

Restart your application and you should be back in business.

P.S. You might enjoy following me on Twitter.


Want to stay up-to-date with Ruby on Rails?

Join 45,516+ developers who get early access to new tutorials, screencasts, articles, and more.

    We care about the protection of your data. Read our Privacy Policy.

    logo Created with Sketch.

    Ruby on Rails tutorials, guides, and screencasts for web developers learning Ruby, Rails, Javascript, Turbolinks, Stimulus.js, Vue.js, and more. Icons by Icons8

    © 2021 GoRails, LLC. All rights reserved.