Extract ActiveRecord::SessionStore from Rails

This functionality will be available from gem
`active_record-session_store` instead.

actionpack/CHANGELOG.md

@@ -1,5 +1,9 @@
 ## Rails 4.0.0 (unreleased) ##
 
+*   `ActiveRecord::SessionStore` is extracted out of Rails into a gem `activerecord-session_store`.
+    Setting `config.session_store` to `:active_record_store` will no longer work and will break
+    if the `activerecord-session_store` gem isn't available. *Prem Sichanugrist*
+
 *   Fix select_tag when option_tags is nil.
     Fixes #7404.
 

actionpack/lib/action_controller/base.rb

@@ -88,15 +88,6 @@ module ActionController
   #
   # Do not put secret information in cookie-based sessions!
   #
-  # Other options for session storage:
-  #
-  # * ActiveRecord::SessionStore - Sessions are stored in your database, which works better than PStore with multiple app servers and,
-  #   unlike CookieStore, hides your session contents from the user. To use ActiveRecord::SessionStore, set
-  #
-  #     MyApplication::Application.config.session_store :active_record_store
-  #
-  #   in your <tt>config/initializers/session_store.rb</tt> and run <tt>script/rails g session_migration</tt>.
-  #
   # == Responses
   #
   # Each action results in a response, which holds the headers and document to be sent to the user's browser. The actual response

activerecord/CHANGELOG.md

@@ -1,5 +1,8 @@
 ## Rails 4.0.0 (unreleased) ##
 
+*   ActiveRecord::SessionStore has been extracted from Active Record as `activerecord-session_store`
+    gem. Please read the `README.md` file on the gem for the usage. *Prem Sichanugrist*
+
 *   Fix `reset_counters` when there are multiple `belongs_to` association with the
     same foreign key and one of them have a counter cache.
     Fixes #5200.

activerecord/lib/active_record.rb

@@ -53,17 +53,6 @@ module ActiveRecord
   autoload :ReadonlyAttributes
   autoload :Reflection
   autoload :Sanitization
-
-  # ActiveRecord::SessionStore depends on the abstract store in Action Pack.
-  # Eager loading this class would break client code that eager loads Active
-  # Record standalone.
-  #
-  # Note that the Rails application generator creates an initializer specific
-  # for setting the session store. Thus, albeit in theory this autoload would
-  # not be thread-safe, in practice it is because if the application uses this
-  # session store its autoload happens at boot time.
-  autoload :SessionStore
-
   autoload :Schema
   autoload :SchemaDumper
   autoload :SchemaMigration

activerecord/lib/active_record/railties/databases.rake

@@ -408,21 +408,6 @@ db_namespace = namespace :db do
       end
     end
   end
-
-  namespace :sessions do
-    # desc "Creates a sessions migration for use with ActiveRecord::SessionStore"
-    task :create => [:environment, :load_config] do
-      raise 'Task unavailable to this database (no migration support)' unless ActiveRecord::Base.connection.supports_migrations?
-      Rails.application.load_generators
-      require 'rails/generators/rails/session_migration/session_migration_generator'
-      Rails::Generators::SessionMigrationGenerator.start [ ENV['MIGRATION'] || 'add_sessions_table' ]
-    end
-
-    # desc "Clear the sessions table"
-    task :clear => [:environment, :load_config] do
-      ActiveRecord::Base.connection.execute "DELETE FROM #{ActiveRecord::SessionStore::Session.table_name}"
-    end
-  end
 end
 
 namespace :railties do