Configures Ruby on Rails + Devise session in Plug.

Usage

Add the following to your application’s endpoint (or replace an existing call to Plug.Session):

plug Surgex.DeviseSession,
  key: "_my_rails_project_session"

Here’s a list of additional options:

• domain: set it to domain provided in the session_store() call of your Ruby on Rails project

• serializer: set it to Poison or other JSON serializer of choice if your Ruby on Rails project sets cookies_serializer to :json (default in Rails 4.1 and newer)

• signing_salt: set it to the value of encrypted_signed_cookie_salt if your Ruby on Rails project sets it

• encryption_salt: set it to the value of encrypted_cookie_salt if your Ruby on Rails project sets it

• signing_with_salt: set it to false if your Ruby on Rails project is based on Rails 3.2 or older

Remember to also set secret key base to match the one in your Rails project:

config :my_project, MyProject.Web.Endpoint,
  secret_key_base: "secret..."

In order to read the session, you must first fetch the session in your router pipeline:

plug :fetch_session

Finally, you can get the current user’s identifier as follows:

Surgex.DeviseSession.Helpers.get_user_id()