Adds Watcher.any_watched? to check if at least one object of a collection is watched.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11959 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/helpers/watchers_helper.rb

     return '' unless user && user.logged?
     objects = Array.wrap(objects)
 
-    watched = objects.any? {|object| object.watched_by?(user)}
+    watched = Watcher.any_watched?(objects, user)
     css = [watcher_css(objects), watched ? 'icon icon-fav' : 'icon icon-fav-off'].join(' ')
     text = watched ? l(:button_unwatch) : l(:button_watch)
     url = watch_path(

app/models/watcher.rb

   validates_uniqueness_of :user_id, :scope => [:watchable_type, :watchable_id]
   validate :validate_user
 
+  # Returns true if at least one object among objects is watched by user
+  def self.any_watched?(objects, user)
+    objects = objects.reject(&:new_record?)
+    if objects.any?
+      objects.group_by {|object| object.class.base_class}.each do |base_class, objects|
+        if Watcher.where(:watchable_type => base_class.name, :watchable_id => objects.map(&:id), :user_id => user.id).exists?
+          return true
+        end
+      end
+    end
+    false
+  end
+
   # Unwatch things that users are no longer allowed to view
   def self.prune(options={})
     if options.has_key?(:user)

test/unit/watcher_test.rb

     assert_nil issue.addable_watcher_users.detect {|user| !issue.visible?(user)}
   end
 
+  def test_any_watched_should_return_false_if_no_object_is_watched
+    objects = (0..2).map {Issue.generate!}
+
+    assert_equal false, Watcher.any_watched?(objects, @user)
+  end
+
+  def test_any_watched_should_return_true_if_one_object_is_watched
+    objects = (0..2).map {Issue.generate!}
+    objects.last.add_watcher(@user)
+
+    assert_equal true, Watcher.any_watched?(objects, @user)
+  end
+
+  def test_any_watched_should_return_false_with_no_object
+    assert_equal false, Watcher.any_watched?([], @user)
+  end
+
   def test_recipients
     @issue.watchers.delete_all
     @issue.reload