samiron

class Human
  attr_writer :name
  def name
    return @name
  end
end

me = Human.new
me.name = 'samiron'
puts me.name

samiron

module AbstractBeverage
  def cost
    raise Exception, %Q|You should implement the cost for #{self.class}|
  end
end

class DarkRoast
  include AbstractBeverage
  COST = 0.99
  def cost

samiron

require File.expand_path('../boot', __FILE__)

require 'rails/all'
require 'rails_autolink'     #THIS IS THE PLACE YOU NEED TO ADD

if defined?(Bundler)
  # If you precompile assets before deploying to production, use this line
  Bundler.require(*Rails.groups(:assets => %w(development test)))
  # If you want your assets lazily compiled in production, use this line
  # Bundler.require(:default, :assets, Rails.env)

samiron

class CommentsController < ApplicationController
  # GET /comments
  # GET /comments.json
  def index
    @comments = Comment.all

    respond_to do |format|
      format.html # index.html.erb
      format.json { render json: @comments }
    end

samiron

#config/routes.rb
  map.route_a 'my_controller', :controller => "Users", :action => "a"
  map.route_b 'my_controller/uid/:uid', :controller => "Users", :action => "b"

#Generated Links
  route_a_url()            --->  http://localhost:3000/my_controller
  route_b_url(:uid => 10)  --->  http://localhost:3000/my_controller/uid/10
#Requesting to the above url redirects two different actions

#Output of rake routes

samiron

  #Description: We want to show a region(parent) form
  #while showing City information.
  #If the form submitted with Region information, 
  #  - New region will be created
  #  - City#region_id will have the new region id


  def show
    @city = City.find(params[:id])

samiron

#FILE: app/controllers/cities_controller.rb

class CitiesController < ApplicationController

  #When you do a ajax request the respond handler is ':js'
  #So format.js will work. To render a response the new.js.erb 
  #file will be used.
  def new
    @city = City.new
    respond_to do |format|

samiron

#FILE: models/user.rb

samiron

/*
   This part of javascript needs to be included to make 
   a ajax call onchanging the selection value of dropdown.
   Here, application.js is shown just for example. You should 
   load this based on your requirements.
*/

//Use the id of your dropdown instead of "dropdown_id"

$(function($) {

samiron

sub sum{ doit('+', @_) }
sub fact{ mul(1..shift) }
sub mul{ doit('*', @_) }

sub doit
{
    my ($d, @nums) = @_;
    return eval( join($d, @nums) );
}