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demo_app / config / initializers / session_store.rb

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# Be sure to restart your server when you modify this file.

DemoApp::Application.config.session_store :cookie_store, :key => '_demo_app_session'

# Use the database for sessions instead of the cookie-based default,
# which shouldn't be used to store highly confidential information
# (create the session table with "rails generate session_migration")
# DemoApp::Application.config.session_store :active_record_store