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| -rw-r--r-- | activerecord/lib/active_record/identity_map.rb | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/identity_map.rb b/activerecord/lib/active_record/identity_map.rb index 6bf77c71fa..94eece9132 100644 --- a/activerecord/lib/active_record/identity_map.rb +++ b/activerecord/lib/active_record/identity_map.rb @@ -1,4 +1,17 @@ module ActiveRecord + # = Active Record Identity Map + # + # Ensures that each object gets loaded only once by keeping every loaded + # object in a map. Looks up objects using the map when referring to them. + # + # More information on Identity Map pattern: + # http://www.martinfowler.com/eaaCatalog/identityMap.html + # + # == Configuration + # + # In order to activate IdentityMap, set <tt>config.active_record.identity_map = true</tt> + # in your <tt>config/application.rb</tt> file. + # module IdentityMap extend ActiveSupport::Concern |