Rails3: model: replace deprecated validate method at watcher model

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@8072 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/watcher.rb

 
   validates_presence_of :user
   validates_uniqueness_of :user_id, :scope => [:watchable_type, :watchable_id]
+  validate :validate_user
 
   # Unwatch things that users are no longer allowed to view
   def self.prune(options={})
 
   protected
 
-  def validate
+  def validate_user
     errors.add :user_id, :invalid unless user.nil? || user.active?
   end