added taxons decorator and moved comment to spree directory

app/models/spree/comment.rb

@@ -0,0 +1,52 @@
+module Spree
+  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
+
+    belongs_to :commentable, :polymorphic => true
+
+    # NOTE: Comments belong to a user
+    belongs_to :user
+
+    # Helper class method that allows you to build a comment
+    # by passing a commentable object, a user_id, and comment text
+    # example in readme
+    def self.build_from(obj, user_id, comment)
+      c = self.new
+      c.commentable_id = obj.id
+      c.commentable_type = obj.class.base_class.name
+      c.body = comment
+      c.user_id = user_id
+      c
+    end
+
+    #helper method to check if a comment has children
+    def has_children?
+      self.children.size > 0
+    end
+
+    # Helper class method to lookup all comments assigned
+    # to all commentable types for a given user.
+    scope :find_comments_by_user, lambda { |user|
+      where(:user_id => user.id).order('created_at DESC')
+    }
+
+    # Helper class method to look up all comments for
+    # commentable class name and commentable id.
+    scope :find_comments_for_commentable, lambda { |commentable_str, commentable_id|
+      where(:commentable_type => commentable_str.to_s, :commentable_id => commentable_id).order('created_at DESC')
+    }
+
+    # 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
+end

app/models/spree/taxon_decorator.rb

@@ -0,0 +1,8 @@
+Spree::Taxon.class_eval do
+  has_and_belongs_to_many :pages, :join_table => 'spree_pages_taxons'
+
+  def active_products
+    scope = pages.published
+    scope
+  end
+end