Ruby code:

class Widget < ActiveRecord::Base
  attr_accesible :name

end

class Widget
  class Twirlymajig < Widget
    attr_accessible :sprockets

  end
end

Ruby code:

# in app/models/widget.rb
module Widget
  # base namespace for Base, Twirlymajog, and Sprocket,
end

# in app/models/widget/base.rb
module Widget
  class Base < ActiveRecord::Base
    attr_accessible :name

  end
end

# in app/models/widget/twirlymajig.rb
module Widget
  class Twirlymajig < Base
    attr_accessible :sprockets

  end
end

Ruby code:

class Post < ActiveRecord::Base
  serialize :metadata, JSON

end

code:

ActiveSupport::Inflector.inflections do |inflect|
  inflect.irregular 'magic_five', 'magic_fives'
end

code:

belongs_to :potion_1, :class_name => "Potion"
belongs_to :potion_2, :class_name => "Potion"
belongs_to :potion_3, :class_name => "Potion"
belongs_to :potion_4, :class_name => "Potion"
belongs_to :potion_5, :class_name => "Potion"

code:

rails generate model magic_five_potion magic_five_id:integer potion_id:integer position:integer

class MagicFivePotions < ActiveRecord::Base
  belongs_to :magic_five
  belongs_to :potion
  validates :position, :present => true, :inclusion => {:in => 0..4}, 
            :uniqueness => {:scope => :magic_five_id}
end

class MagicFive < ActiveRecord::Base
  has_many :magic_five_potions
  has_many :potions, :through => :magic_five_potions, :order => :position
  
  def potion_in_position(pos)
    magic_five_potions.where(:position => pos).first.potion
  end
end

code:

<!-- ... other page content here -->
  <%= yield :javascripts %>
</body>
</html>

code:

<%= content_for :javascripts do %>
  <%= javascript_include_tag "posts_index" %>
<% end %>

code:

<%= content_for :javascripts do %>
  $(function() {
    var myThing = new MyThing();
    myThing.doWhatever();
  });
<% end %>

code:

code:

PlanItemUpdate.up
NoMethodError: undefined method `up' for PlanItemUpdate(Table doesn't exist):Class
        from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/base.rb:1959:in `method_missing'
        from (irb):4

code:

FOO=helloworld ruby -e "print ENV['FOO']"

code:

ruby -e "print ENV['FOO']" FOO=helloworld

code:

def after_sign_in_path_for(resource)
 	cellar_user(resource)
  end

code:

 devise_for :users
  resources :users do
    member do
      get :cellar, :following, :followers
    end
  end

code:

cellar_user GET    /users/:id/cellar(.:format)    users#cellar