Ability to assign issues to groups (#2964).

Option is disabled by default. It can be turned on in application settings.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@6306 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/principal.rb

@@ -1,5 +1,5 @@
 # Redmine - project management software
-# Copyright (C) 2006-2009  Jean-Philippe Lang
+# Copyright (C) 2006-2011  Jean-Philippe Lang
 #
 # This program is free software; you can redistribute it and/or
 # modify it under the terms of the GNU General Public License
@@ -21,6 +21,7 @@ class Principal < ActiveRecord::Base
   has_many :members, :foreign_key => 'user_id', :dependent => :destroy
   has_many :memberships, :class_name => 'Member', :foreign_key => 'user_id', :include => [ :project, :roles ], :conditions => "#{Project.table_name}.status=#{Project::STATUS_ACTIVE}", :order => "#{Project.table_name}.name"
   has_many :projects, :through => :memberships
+  has_many :issue_categories, :foreign_key => 'assigned_to_id', :dependent => :nullify
 
   # Groups and active users
   named_scope :active, :conditions => "#{Principal.table_name}.type='Group' OR (#{Principal.table_name}.type='User' AND #{Principal.table_name}.status = 1)"