A session store backed by an Active Record class. A default class is provided, but any object duck-typing to an Active Record Session class with text session_id and data attributes is sufficient.

The default assumes a sessions tables with columns:

+id+ (numeric primary key),
+session_id+ (text, or longtext if your session data exceeds 65K), and
+data+ (text or longtext; careful if your session data exceeds 65KB).

The session_id column should always be indexed for speedy lookups. Session data is marshaled to the data column in Base64 format. If the data you write is larger than the column’s size limit, ActionController::SessionOverflowError will be raised.

You may configure the table name, primary key, and data column. For example, at the end of config/environment.rb:

CGI::Session::ActiveRecordStore::Session.table_name = 'legacy_session_table'
CGI::Session::ActiveRecordStore::Session.primary_key = 'session_id'
CGI::Session::ActiveRecordStore::Session.data_column_name = 'legacy_session_data'

Note that setting the primary key to the session_id frees you from having a separate id column if you don’t want it. However, you must set session.model.id = session.session_id by hand! A before_filter on ApplicationController is a good place.

Since the default class is a simple Active Record, you get timestamps for free if you add created_at and updated_at datetime columns to the sessions table, making periodic session expiration a snap.

You may provide your own session class implementation, whether a feature-packed Active Record or a bare-metal high-performance SQL store, by setting

+CGI::Session::ActiveRecordStore.session_class = MySessionClass+

You must implement these methods:

self.find_by_session_id(session_id)
initialize(hash_of_session_id_and_data)
attr_reader :session_id
attr_accessor :data
save
destroy

The example SqlBypass class is a generic SQL session store. You may use it as a basis for high-performance database-specific stores.

Namespace
Methods
C
D
L
M
N
R
U
Class Public methods
new(session, option = nil)

Find or instantiate a session given a CGI::Session.

Source: show 

# File rails/actionpack/lib/action_controller/session/active_record_store.rb, line 281
def initialize(session, option = nil)
  session_id = session.session_id
  unless @session = ActiveRecord::Base.silence { @@session_class.find_by_session_id(session_id) }
    unless session.new_session
      raise CGI::Session::NoSession, 'uninitialized session'
    end
    @session = @@session_class.new(:session_id => session_id, :data => {})
    # session saving can be lazy again, because of improved component implementation
    # therefore next line gets commented out:
    # @session.save
  end
end
Instance Public methods
close()

Save and close the session store.

Source: show 

# File rails/actionpack/lib/action_controller/session/active_record_store.rb, line 314
def close
  if @session
    update
    @session = nil
  end
end
delete()

Delete and close the session store.

Source: show 

# File rails/actionpack/lib/action_controller/session/active_record_store.rb, line 322
def delete
  if @session
    ActiveRecord::Base.silence { @session.destroy }
    @session = nil
  end
end
model()

Access the underlying session model.

Source: show 

# File rails/actionpack/lib/action_controller/session/active_record_store.rb, line 295
def model
  @session
end
restore()

Restore session state. The session model handles unmarshaling.

Source: show 

# File rails/actionpack/lib/action_controller/session/active_record_store.rb, line 300
def restore
  if @session
    @session.data
  end
end
update()

Save session store.

Source: show 

# File rails/actionpack/lib/action_controller/session/active_record_store.rb, line 307
def update
  if @session
    ActiveRecord::Base.silence { @session.save }
  end
end
Instance Protected methods
logger()

Source: show 

# File rails/actionpack/lib/action_controller/session/active_record_store.rb, line 330
def logger
  ActionController::Base.logger rescue nil
end