Object
A barebones session store which duck-types with the default session store but bypasses Active Record and issues SQL directly. This is an example session model class meant as a basis for your own classes.
The database connection, table name, and session id and data columns are configurable class attributes. Marshaling and unmarshaling are implemented as class methods that you may override. By default, marshaling data is
ActiveSupport::Base64.encode64(Marshal.dump(data))
and unmarshaling data is
Marshal.load(ActiveSupport::Base64.decode64(data))
This marshaling behavior is intended to store the widest range of binary session data in a text column. For higher performance, store in a blob column instead and forgo the Base64 encoding.
Use the ActiveRecord::Base.connection by default.
# File lib/active_record/session_store.rb, line 183 cattr_accessor :connection
The data field defaults to ‘data’.
# File lib/active_record/session_store.rb, line 200 cattr_accessor :data_column
Look up a session by id and unmarshal its data if found.
# File lib/active_record/session_store.rb, line 212 def find_by_session_id(session_id) if record = connection.select_one("SELECT * FROM #{@@table_name} WHERE #{@@session_id_column}=#{connection.quote(session_id)}") new(:session_id => session_id, :marshaled_data => record['data']) end end
Look for normal and marshaled data, self.find_by_session_id’s way of telling us to postpone unmarshaling until the data is requested. We need to handle a normal data attribute in case of a new record.
# File lib/active_record/session_store.rb, line 227 def initialize(attributes) @session_id = attributes[:session_id] @data = attributes[:data] @marshaled_data = attributes[:marshaled_data] @new_record = @marshaled_data.nil? end
The session id field defaults to ‘session_id’.
# File lib/active_record/session_store.rb, line 194 cattr_accessor :session_id_column
Lazy-unmarshal session state.
# File lib/active_record/session_store.rb, line 235 def data unless @data if @marshaled_data @data, @marshaled_data = self.class.unmarshal(@marshaled_data) || {}, nil else @data = {} end end @data end
# File lib/active_record/session_store.rb, line 274 def destroy return if @new_record connect = connection connect.delete DELETE FROM #{table_name} WHERE #{connect.quote_column_name(session_id_column)}=#{connect.quote(session_id)}, 'Destroy session' end
# File lib/active_record/session_store.rb, line 246 def loaded? @data end
# File lib/active_record/session_store.rb, line 250 def save return false unless loaded? marshaled_data = self.class.marshal(data) connect = connection if @new_record @new_record = false connect.update INSERT INTO #{table_name} ( #{connect.quote_column_name(session_id_column)}, #{connect.quote_column_name(data_column)} ) VALUES ( #{connect.quote(session_id)}, #{connect.quote(marshaled_data)} ), 'Create session' else connect.update UPDATE #{table_name} SET #{connect.quote_column_name(data_column)}=#{connect.quote(marshaled_data)} WHERE #{connect.quote_column_name(session_id_column)}=#{connect.quote(session_id)}, 'Update session' end end
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