Make it possible to use a regular scope string in addition to the symbol shortcut

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@181 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/lib/active_record/mixins/list.rb

@@ -45,7 +45,11 @@ module ActiveRecord
             end
 
             def scope_condition
-              "#{configuration[:scope]} = \#{#{configuration[:scope]}}"
+              if configuration[:scope].is_a?(Symbol)
+                "#{configuration[:scope]} = \#{#{configuration[:scope]}}"
+              else
+                configuration[:scope]
+              end
             end
             
             before_destroy :remove_from_list