Upgrade to support threads.

app/models/setting.rb

@@ -7,12 +7,10 @@ class Setting < ActiveRecord::Base
   after_update  :delete_cache
   after_destroy :delete_cache
 
-  @@config = nil
-
   def self.load
 
     # check if config is already generated
-    return @@config if @@config
+    return Thread.current[:settings_config] if Thread.current[:settings_config]
 
     # read all config settings
     config = {}
@@ -29,18 +27,18 @@ class Setting < ActiveRecord::Base
     }
 
     # store for class requests
-    @@config = config
+    Thread.current[:settings_config] = config
     return config
   end
 
   def self.get(name)
     self.load
-    return @@config[name]
+    return Thread.current[:settings_config][name]
   end
 
   private
     def delete_cache
-      @@config = nil
+      Thread.current[:settings_config] = nil
     end
     def set_initial
       self.state_initial = self.state