Adds a branch for unlimited project hierarchy.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/branches/work@2148 e93f8b46-1217-0410-a6f0-8f06a7374b81

nested_projects/db/migrate/072_add_enumerations_position.rb

@@ -0,0 +1,15 @@
+class AddEnumerationsPosition < ActiveRecord::Migration
+  def self.up
+    add_column(:enumerations, :position, :integer, :default => 1) unless Enumeration.column_names.include?('position')
+    Enumeration.find(:all).group_by(&:opt).each do |opt, enums|
+      enums.each_with_index do |enum, i|
+        # do not call model callbacks
+        Enumeration.update_all "position = #{i+1}", {:id => enum.id}
+      end
+    end
+  end
+
+  def self.down
+    remove_column :enumerations, :position
+  end
+end