work on forum

app/models/forum_post.rb

@@ -8,6 +8,17 @@ class ForumPost < ActiveRecord::Base
   validates_presence_of :body, :creator_id
   scope :body_matches, lambda {|body| where(["text_index @@ plainto_tsquery(?)", body])}
   search_method :body_matches
+  
+  def self.new_reply(params)
+    if params[:topic_id]
+      new(:topic_id => params[:topic_id])
+    elsif params[:post_id]
+      forum_post = ForumPost.find(params[:post_id])
+      forum_post.build_response
+    else
+      new
+    end
+  end
 
   def editable_by?(user)
     creator_id == user.id || user.is_moderator?
@@ -25,4 +36,10 @@ class ForumPost < ActiveRecord::Base
   def initialize_updater
     self.updater_id = CurrentUser.id
   end
+  
+  def build_response
+    dup.tap do |x|
+      x.body = "[quote]\n#{x.body}\n[/quote]\n\n"
+    end
+  end
 end

app/models/forum_topic.rb

@@ -22,4 +22,12 @@ class ForumTopic < ActiveRecord::Base
   def initialize_updater
     self.updater_id = CurrentUser.id
   end
+  
+  def last_page
+    (posts.count / Danbooru.config.posts_per_page.to_f).ceil
+  end
+  
+  def presenter(forum_posts)
+    @presenter ||= ForumTopicPresenter.new(self, forum_posts)
+  end
 end