refactor forum notifications for tag changes

app/logical/forum_updater.rb

@@ -0,0 +1,38 @@
+class ForumUpdater
+  attr_reader :forum_topic, :forum_post, :expected_title
+
+  def initialize(forum_topic, options = {})
+    @forum_topic = forum_topic
+    @forum_post = options[:forum_post]
+    @expected_title = options[:expected_title]
+  end
+
+  def update(message, title_tag = nil)
+    return if forum_topic.nil?
+    
+    CurrentUser.scoped(User.system) do
+      create_response(message)
+      update_title(title_tag) if title_tag
+
+      if forum_post
+        update_post(message)
+      end
+    end
+  end
+
+  def create_response(body)
+    forum_topic.posts.create(
+      :body => body
+    )
+  end
+
+  def update_title(title_tag)
+    if forum_topic.title == expected_title
+      forum_topic.update(:title => "[#{title_tag}] #{forum_topic.title}")
+    end
+  end
+
+  def update_post(body)
+    forum_post.update(:body => "#{forum_post.body}\n\n#{body}")
+  end
+end