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class ApplicationController < ActionController::Base
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  protect_from_forgery with: :exception

  private
  
  def current_cart
    @current_cart ||= begin
      Cart.find(session[:cart_id])

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def form_for_login(&block)
  form_for(resource,
    as: resource_name,
    url: session_path(resource_name),
    html: {
      class: 'navbar-form navbar-right',
      role: 'login'
    }, &block)
  end
end

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class Challenge < AR::Base
  belongs_to :category
  has_many :participations
  has_many :participants, through: :participations
end

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<div class="chatboxinput">
  <%= form_for([@conversation, @message], :url => conversation_messages_path(@conversation, @message, format: 'js'), :remote => true, :html => {id: "conversation_form_#{@conversation.id}"}) do |f| %>
      <%= f.text_area :body, class: "chatboxtextarea", "data-cid" => @conversation.id %>
      <%= hidden_field_tag :authenticity_token, form_authenticity_token %>
  <% end %>
</div>

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class NotePolicy < ApplicationPolicy
	
  # For index action
  class Scope
    attr_reader :user, :scope
    def initialize(user, scope)
      @user = user
      @scope = scope
    end

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class CreateCategories < ActiveRecord::Migration
  def change
    create_table :categories do |t|

      t.string :name

      t.timestamps
    end
  end
end

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class CreateGroupLocations < ActiveRecord::Migration
  def change
    create_table :group_locations do |t|
      t.belongs_to :address, index: true, foreign_key: true
      t.belongs_to :group, index: true, foreign_key: true

      t.timestamps null: false
    end
  end
end

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urls.each do |url|
  begin
    open(url)
    # do some nokogiri things
  rescue OpenURI::HTTPError
    # log the error
  end
end

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if params[:friend_id]
  friend = User.find(params[:friend_id])
else
  # ...
end

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Rails.application.routes.draw do
  resources :categories
  devise_for :admins
  devise_for :users
  resources :users
  
  namespace :admin do
    resources :categories
  end