Add exclusions for actions and fields.

README

@@ -76,6 +76,8 @@ available are:
      - an array containing symbols describing on which actions to write
        audit logs. Defaults to 
          [ :accessed, :modified, :saved, :created, :deleted ].
+     - opposite :except => []
+       speficially exclude an action from auditing.
   :identity =>
      - Auditable also adds an around_filter to your ApplicationController 
        to make sure that it has access to the currently logged in user 
@@ -88,6 +90,8 @@ available are:
        Defaults to [ :all ] (:all is a special name meaning all fields).
        Note that you can never audit :id because it will cause an infinite
        loop.
+     - opposite :not => []
+       specifically exclude a field from auditing.
   :log_field =>
      - A symbol naming the text field in the auditor model to store the
        log information in. Only useful if you need something more than the

lib/acts_as_auditable.rb

@@ -37,6 +37,7 @@ def acts_as_auditable(options={})
             :except => [],
             :identity => :current_user,
             :for => [ :all ],
+            :not => [],
             :log_field => :log,
             :identity_field => :identity,
           }
@@ -142,7 +143,7 @@ def #{m}
           if options[:for].member? :all
             columns = self.column_names()
           else
-            columns = options[:for].collect do |column|
+            columns = (options[:for]-options[:not]).collect do |column|
               column.to_s
             end
           end