add instructor endorsement field

db/migrate/006_add_endorsed_to_comments.rb

+class AddEndorsedToComments < ActiveRecord::Migration
+  def self.up
+    add_column :comments, :endorsed, :boolean, :default => false
+  end
+  
+  def self.down
+    remove_column :comments, :endorsed
+  end
+end

models/comment.rb

@@ -4,7 +4,7 @@ require 'thumbs_up'
 
 class Comment < ActiveRecord::Base
 
-  attr_accessible :body, :title, :user_id, :course_id, :comment_thread_id
+  attr_accessible :body, :title, :user_id, :course_id, :endorsed, :comment_thread_id
 
   has_ancestry :cache_depth => true