All specs pass already. Awesome.

MIT-LICENSE

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+Copyright (c) 2008 Evan David Light
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README

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+Acts As Commentable
+=================
+
+Allows for threaded comments to be added to multiple and different models.  Drop-in compatible for acts_as_commentable (however requiring a database schema change)
+
+== Resources
+
+Install
+
+  Rails
+
+   * To install as a plugin:
+
+    script/plugin install http://github.com/jackdempsey/acts_as_commentable
+
+  Merb/Rails
+
+   * To install as a gem:
+
+   rake install
+
+ * Create a new rails migration and add the following self.up and self.down methods
+
+  def self.up
+    create_table "comments", :force => true do |t|
+      t.integer "commentable_id", :default => 0
+      t.string "commentable_type", :limit => 15, :default => ""
+      t.string "title", :default => ""
+      t.text "body", :default => ""
+      t.string "subject", :default => ""
+      t.integer "user_id", :default => 0, :null => false
+      t.integer "parent_id"
+      t.integer "lft"
+      t.integer "rgt"
+      t.timestamps
+    end
+
+    add_index "comments", "user_id"
+    add_index "comments", "commentable_id"
+  end
+
+  def self.down
+    drop_table :comments
+  end
+
+== Usage
+ class Model < ActiveRecord::Base
+ 	acts_as_commentable_with_threading
+ end
+
+ * Add a comment to a model instance
+
+ model = Model.new
+ comment = Comment.new(:model => model, :body => "Your comment text here")
+ comment.save!
+ comment.move_to_child_of(the_desired_parent_comment)
+
+ # Following doesn't work/make sense to me. Leaving for historical sake -- Jack
+ # * Each comment reference commentable object
+ #
+ # model = Model.find(1)
+ # model.comments.get(0).commentable == model
+
+== Credits
+
+Jack Dempsey  - This plugin/gem is heavily influenced/liberally borrowed/stole from acts_as_commentable
+
+which in turn credits....
+
+Xelipe - Because acts_as_commentable was heavily influenced by Acts As Taggable.
+
+== More
+
+http://triple-dog-dare.com
+http://evan.tiggerpalace.com

Rakefile

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+require 'rubygems'
+require 'rake/gempackagetask'
+require 'spec'
+require 'spec/rake/spectask'
+
+PLUGIN = "acts_as_commentable_with_threading"
+NAME = "acts_as_commentable_with_threading"
+GEM_VERSION = "1.0.0"
+AUTHOR = "Evan Light"
+EMAIL = "evan@triple-dog-dare.com"
+SUMMARY = "Plugin/gem that provides threaded comment functionality"
+
+load 'acts_as_commentable_with_threading.gemspec'
+spec = ACTS_AS_COMMENTABLE_WITH_THREADING
+
+Rake::GemPackageTask.new(spec) do |pkg|
+  pkg.gem_spec = spec
+end
+
+Spec::Rake::SpecTask.new do |t|
+  t.spec_files = FileList['spec/**_spec.rb']
+end
+
+task :install => [:package] do
+  sh %{sudo gem install pkg/#{NAME}-#{GEM_VERSION}}
+end
+
+task :default => :spec

acts_as_commentable_with_threading.gemspec

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+ACTS_AS_COMMENTABLE_WITH_THREADING = Gem::Specification.new do |s|
+  s.name     = "acts_as_commentable_with_threading"
+  s.version  = "0.1.0"
+  s.date     = "2008-11-16"
+  s.summary  = "Polymorphic comments Rails plugin"
+  s.email    = "evan@tiggerpalace.com"
+  s.homepage = "http://github.com/elight/acts_as_commentable_with_threading"
+  s.description = "Polymorphic threaded comments Rails plugin/gem"
+  s.has_rdoc = true
+  s.authors  = ["Evan Light", "Jack Dempsey", "Xelipe"] 
+  s.files    = [
+    "CHANGELOG", 
+		"MIT-LICENSE", 
+		"README",
+		"Rakefile", 
+		"acts_as_commentable_with_threading.gemspec", 
+                "init.rb",
+                "install.rb",
+		"lib/acts_as_commentable_with_threading.rb", 
+		"lib/comment.rb"]
+  s.test_files = ["spec/acts_as_commentable_test.rb"]
+  s.rdoc_options = ["--main", "README"]
+
+  s.add_dependency 'awesome_nested_set'
+end

init.rb

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+# Include hook code here
+require 'acts_as_commentable_with_threading'
+

install.rb

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+# Install hook code here

lib/acts_as_commentable_with_threading.rb

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+require 'activerecord'
+require 'awesome_nested_set'
+ActiveRecord::Base.class_eval do
+  include CollectiveIdea::Acts::NestedSet
+end
+require 'comment'
+
+# ActsAsCommentableWithThreading
+module Acts #:nodoc:
+  module CommentableWithThreading #:nodoc:
+
+    def self.included(base)
+      base.extend ClassMethods  
+    end
+
+    module ClassMethods
+      def acts_as_commentable
+        has_many :root_comments, :class_name => "Comment", :as => :commentable, :dependent => :destroy, :order => 'created_at ASC'
+        include Acts::CommentableWithThreading::InstanceMethods
+        extend Acts::CommentableWithThreading::SingletonMethods
+      end
+    end
+
+    # This module contains class methods
+    module SingletonMethods
+      # Helper method to lookup for comments for a given object.
+      # This method is equivalent to obj.comments.
+      def find_comments_for(obj)
+        commentable = ActiveRecord::Base.send(:class_name_of_active_record_descendant, self).to_s
+
+        Comment.find(:all,
+          :conditions => ["commentable_id = ? and commentable_type = ?", obj.id, commentable],
+          :order => "created_at DESC"
+        )
+      end
+
+      # Helper class method to lookup comments for
+      # the mixin commentable type written by a given user.  
+      # This method is NOT equivalent to Comment.find_comments_for_user
+      def find_comments_by_user(user) 
+        commentable = ActiveRecord::Base.send(:class_name_of_active_record_descendant, self).to_s
+
+        Comment.find(:all,
+          :conditions => ["user_id = ? and commentable_type = ?", user.id, commentable],
+          :order => "created_at DESC"
+        )
+      end
+    end
+
+    # This module contains instance methods
+    module InstanceMethods
+      # Helper method to sort comments by date
+      def comments_ordered_by_submitted
+        Comment.find(:all,
+          :conditions => ["commentable_id = ? and commentable_type = ?", id, self.type.name],
+          :order => "created_at DESC"
+        )
+      end
+
+      # Helper method that defaults the submitted time.
+      def add_comment(comment)
+        comments << comment
+      end
+    end
+
+  end
+end
+
+ActiveRecord::Base.send(:include, Acts::CommentableWithThreading)

lib/comment.rb

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+class Comment < ActiveRecord::Base
+  acts_as_nested_set :scope => [:commentable_id, :commentable_type]
+
+  validates_presence_of :body
+  validates_presence_of :user
+
+  # NOTE: install the acts_as_votable plugin if you 
+  # want user to vote on the quality of comments.
+  #acts_as_voteable
+
+  # NOTE: Comments belong to a user
+  belongs_to :user
+
+  # Helper class method to lookup all comments assigned
+  # to all commentable types for a given user.
+  def self.find_comments_by_user(user)
+    find(:all,
+      :conditions => ["user_id = ?", user.id],
+      :order => "created_at DESC"
+    )
+  end
+
+  # Helper class method to look up all comments for 
+  # commentable class name and commentable id.
+  def self.find_comments_for_commentable(commentable_str, commentable_id)
+    find(:all,
+      :conditions => ["commentable_type = ? and commentable_id = ?", commentable_str, commentable_id],
+      :order => "created_at DESC"
+    )
+  end
+
+  # Helper class method to look up a commentable object
+  # given the commentable class name and id 
+  def self.find_commentable(commentable_str, commentable_id)
+    commentable_str.constantize.find(commentable_id)
+  end
+end

spec/comment_spec.rb

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+require File.join(File.dirname(__FILE__), "spec_helper")
+
+# Specs some of the behavior of awesome_nested_set although does so to demonstrate the use of this gem
+describe Comment do
+  before do
+    @user = User.create!
+    @comment = Comment.create!(:body => "Root comment", :user => @user)
+  end
+
+  describe "that is valid" do
+    it "should have a user" do
+      @comment.user.should_not be_nil
+    end
+
+    it "should have a body" do
+      @comment.body.should_not be_nil
+    end
+  end
+
+  it "should not have a parent if it is a root Comment" do
+    @comment.parent.should be_nil
+  end
+
+  it "can have see how child Comments it has" do
+    @comment.children.size.should == 0
+  end
+
+  it "can add child Comments" do
+    grandchild = Comment.new(:body => "This is a grandchild", :user => @user)
+    grandchild.save!
+    grandchild.move_to_child_of(@comment)
+    @comment.children.size.should == 1
+  end    
+
+  describe "after having a child added" do
+    before do
+      @child = Comment.create!(:body => "Child comment", :user => @user)
+      @child.move_to_child_of(@comment)
+    end
+
+    it "can be referenced by its child" do    
+      @child.parent.should == @comment
+    end
+
+    it "can see its child" do
+      @comment.children.first.should == @child
+    end
+  end
+end

spec/commentable_spec.rb

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+require File.join(File.dirname(__FILE__), "spec_helper")
+
+describe "A class that is commentable" do
+  it "can have many root comments" do
+    Commentable.new.root_comments.should be_a_kind_of(Enumerable)
+  end
+end

spec/db/database.yml

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+sqlite3:
+  adapter: sqlite3
+  dbfile: acts_as_commentable_with_threading.sqlite3.db
+sqlite3mem:
+  :adapter: sqlite3
+  :dbfile: ":memory:"
+postgresql:
+  :adapter: postgresql
+  :username: postgres
+  :password: postgres
+  :database: acts_as_commentable_with_threading_plugin_test
+  :min_messages: ERROR
+mysql:
+  :adapter: mysql
+  :host: localhost
+  :username: root
+  :password:
+  :database: acts_as_commentable_with_threading_plugin_test

spec/db/schema.rb

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+ActiveRecord::Schema.define(:version => 0) do
+  create_table "users", :force => true do |t|
+    t.timestamps
+  end
+
+  create_table "commentables", :force => true do |t|
+    t.timestamps
+  end
+
+  create_table "comments", :force => true do |t|
+    t.integer "commentable_id", :default => 0
+    t.string "commentable_type", :limit => 15, :default => ""
+    t.string "title", :default => ""
+    t.text "body", :default => ""
+    t.string "subject", :default => ""
+    t.integer "user_id", :default => 0, :null => false
+    t.integer "parent_id"
+    t.integer "lft"
+    t.integer "rgt"
+    t.timestamps
+  end
+
+  add_index "comments", "user_id"
+  add_index "comments", "commentable_id"
+end