Added watchers for message boards (watchers controller modified to support any watchable model).

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git-svn-id: http://redmine.rubyforge.org/svn/trunk@530 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/helpers/watchers_helper.rb

@@ -16,4 +16,21 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 module WatchersHelper
+  def watcher_tag(object, user)
+    content_tag("span", watcher_link(object, user), :id => 'watcher')
+  end
+  
+  def watcher_link(object, user)
+    return '' unless user && object.respond_to?('watched_by?')
+    watched = object.watched_by?(user)
+    url = {:controller => 'watchers',
+           :action => (watched ? 'remove' : 'add'),
+           :object_type => object.class.to_s.underscore,
+           :object_id => object.id}           
+    link_to_remote((watched ? l(:button_unwatch) : l(:button_watch)),
+                   {:url => url},
+                   :href => url_for(url),
+                   :class => (watched ? 'icon icon-fav' : 'icon icon-fav-off'))
+  
+  end
 end