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Guides: when migrating from 3.0, change NAME::Application.config.session_store #7685
In the guides for upgrading from Rails 3.0 to Rails 3.1, it would be helpful to document that the session_store key needs to be changed.
# config/initializers/session_store.rb AppName::Application.config.session_store :cookie_store, :key => 'SOMETHINGNEW'
This migration step is also documented in this ticket #2509 (comment)