Adds watch/unwatch functionality at forum topic level (#1912).

Users who create/reply a topic are automatically added as watchers but are now able to unwatch the topic.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@1878 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/message.rb

@@ -33,11 +33,14 @@ class Message < ActiveRecord::Base
                                                                                                                                        {:id => o.parent_id, :anchor => "message-#{o.id}"})}
 
   acts_as_activity_provider :find_options => {:include => [{:board => :project}, :author]}
+  acts_as_watchable
     
   attr_protected :locked, :sticky
   validates_presence_of :subject, :content
   validates_length_of :subject, :maximum => 255
   
+  after_create :add_author_as_watcher
+  
   def validate_on_create
     # Can not reply to a locked topic
     errors.add_to_base 'Topic is locked' if root.locked? && self != root
@@ -68,4 +71,10 @@ class Message < ActiveRecord::Base
   def project
     board.project
   end
+  
+  private
+  
+  def add_author_as_watcher
+    Watcher.create(:watchable => self.root, :user => author)
+  end
 end