Added project specific Enumeration overrides.

These will be used to track if Enumeration's custom data or active state
is overridden on a project.  An overridden Enumeration is one that is associated
with a parent Enumeration.

  #4077

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@2947 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/enumeration.rb

@@ -16,8 +16,11 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 class Enumeration < ActiveRecord::Base
+  belongs_to :project
+  
   acts_as_list :scope => 'type = \'#{type}\''
   acts_as_customizable
+  acts_as_tree :order => 'position ASC'
 
   before_destroy :check_integrity
   
@@ -101,6 +104,11 @@ class Enumeration < ActiveRecord::Base
   def in_use?
     self.objects_count != 0
   end
+
+  # Is this enumeration overiding a system level enumeration?
+  def is_override?
+    !self.parent.nil?
+  end
   
   alias :destroy_without_reassign :destroy