Nested Model & Controller & Route

schema.rb

ActiveRecord::Schema.define(:version => 20110221190024) do
 
  create_table "comments", :force => true do |t|
    t.string   "title"
    t.text     "body"
    t.integer  "commentable_id"
    t.string   "commentable_type"
    t.datetime "created_at"
    t.datetime "updated_at"
  end
 
  add_index "comments", ["commentable_id", "commentable_type"], :name => "index_comments_on_commentable_id_and_commentable_type"
 
  create_table "posts", :force => true do |t|
    t.string   "title"
    t.text     "body"
    t.datetime "created_at"
    t.datetime "updated_at"
  end
 
end