Merge pull request #873 from concerto/871_purge_pa

Added Activity model, ConcertoConfig entry, and cron entry to achieve #871

config/initializers/02-concerto_config.rb

@@ -49,6 +49,7 @@
     ConcertoConfig.make_concerto_config("system_time_zone", 'Eastern Time (US & Canada)', :value_type => "timezone", :category => 'System') 
     ConcertoConfig.make_concerto_config("config_last_updated", "0", :value_type => "integer", :hidden => "true", :category => 'System')
     ConcertoConfig.make_concerto_config("http_proxy_settings", "", :value_type => "string", :category => 'System', :description => 'http://username:password@hostname:port')   
+    ConcertoConfig.make_concerto_config("keep_activity_log", "90", :value_type => "integer", :value_default => "90", :category => 'System', :description => 'Days to keep activity log for (where 0 is forever)') 
 
   end
 

lib/cron.rb

@@ -20,4 +20,15 @@ module Clockwork
   every(1.day, 'Deny Expired Content Submissions') do
     Submission.delay.deny_old_expired
   end
+
+  if RUBY_VERSION >= "1.9"  
+    every(1.day, 'Remove old public activity entries') do  
+      unless ConcertoConfig[:keep_activity_log].to_i == 0
+        activities =  PublicActivity::Activity.where("created_at > :days", {:days => ConcertoConfig[:keep_activity_log].to_i.days.ago}).destroy_all
+      end
+    end  
+  end
+
 end
+
+