MODELS
======

class Todo < ActiveRecord::Base
  belongs_to :user

  validates :title, :presence => true, :length => { :maximum => 65 }

  scope :recent, order("created_at DESC")
  scope :incomplete, recent.where(["done = ?", false])
end

class User < ActiveRecord::Base

  # Include default devise modules. Others available are:
  # :token_authenticatable, :confirmable, :lockable and :timeoutable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable

  # Setup accessible (or protected) attributes for your model
  attr_accessible :email, :password, :password_confirmation

  has_many :todos
end

ROUTES
======
Karya::Application.routes.draw do |map|
  resources :users do
    resources :todos do
      post :mark_done, :on => :collection
    end
  end

  devise_for :users

  root :to => "todos#index"
end

PROBLEM WITH form_form (Added new lines to read better)
=======================================================
(ruby-1.9.2@dev)(~/projects/karya)९ rails c -s
Loading development environment in sandbox (Rails 3.0.0.beta4)
Any modifications you make will be rolled back on exit

ruby-1.9.2-head > user = User.find(1)
 => #<User id: 1, email: "hello@rohitarondekar.com", encrypted_password: "$2a$10$03wAcpK/y10kGB8pURWHZev4wDexsK2/4Ox8e/elcJjf...", password_salt: "$2a$10$03wAcpK/y10kGB8pURWHZe", reset_password_token: nil, remember_token: nil, remember_created_at: nil, sign_in_count: 0, current_sign_in_at: nil, last_sign_in_at: nil, current_sign_in_ip: nil, last_sign_in_ip: nil, created_at: "2010-06-24 04:32:58", updated_at: "2010-06-24 04:32:58">


ruby-1.9.2-head > new_todo = user.todos.new
 => #<Todo id: nil, title: nil, created_at: nil, updated_at: nil, done: false, user_id: 1>


ruby-1.9.2-head > helper.form_for(new_todo) { |f| f.submit "submit" }
NoMethodError: undefined method `polymorphic_path' for #<ActionView::Base:0x0000000313aaf8>
	from /home/rohit/.rvm/gems/ruby-1.9.2-head@dev/gems/actionpack-3.0.0.beta4/lib/action_view/helpers/form_helper.rb:329:in `apply_form_for_options!'
	from /home/rohit/.rvm/gems/ruby-1.9.2-head@dev/gems/actionpack-3.0.0.beta4/lib/action_view/helpers/form_helper.rb:301:in `form_for'
	from (irb):3
	from /home/rohit/.rvm/gems/ruby-1.9.2-head@dev/gems/railties-3.0.0.beta4/lib/rails/commands/console.rb:47:in `start'
	from /home/rohit/.rvm/gems/ruby-1.9.2-head@dev/gems/railties-3.0.0.beta4/lib/rails/commands/console.rb:8:in `start'
	from /home/rohit/.rvm/gems/ruby-1.9.2-head@dev/gems/railties-3.0.0.beta4/lib/rails/commands.rb:23:in `<top (required)>'
	from script/rails:9:in `require'
	from script/rails:9:in `<main>'