Allow same name for custom fields on different object types.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@1730 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/custom_field.rb

@@ -30,7 +30,7 @@ class CustomField < ActiveRecord::Base
   }.freeze
 
   validates_presence_of :name, :field_format
-  validates_uniqueness_of :name
+  validates_uniqueness_of :name, :scope => :type
   validates_length_of :name, :maximum => 30
   validates_format_of :name, :with => /^[\w\s\'\-]*$/i
   validates_inclusion_of :field_format, :in => FIELD_FORMATS.keys