vinhnglx

class User
  attr_accessor :first_name, :last_name, :birthday
end

# Results
# user = User.new
# user.first_name = "Vinh"
# user.first_name => "Vinh"

vinhnglx

class User
  attr_accessor :first_name, :last_name, :birthday
end

# Results
# user = User.new
# user.middle_name ==> NoMethodError

vinhnglx

class User
  attr_accessor :first_name, :last_name, :birthday
  
  # method_missing() is passed 2 arguments: name of the missing method and arrays of its arguments
  # reference at the link: http://www.ruby-doc.org/core-2.1.0/BasicObject.html#method-i-method_missing
  def method_missing(name, *arg)
    puts "#{name} was called with arguments: #{arg.join(',')}. #{name} method not available."
  end
end

vinhnglx

class Question
  def get_question_title
    puts "get_question_title called"
  end
  
  def get_question_content
    puts "get_question_content called"
  end
end

vinhnglx

# ====================
# Spell: Dynamic Proxy
# ====================

# Forward to another object any messages that don’t match a method.

class MyDynamicProxy
  def initialize(target)
    @target = target
  end

vinhnglx

config.generators.stylesheet_engine = :sass

vinhnglx

module DefaultValues

  def has_default_values(default_values = {})

    class_attribute :default_values
    self.default_values = default_values

    after_initialize :assign_default_values

    include InstanceMethods

vinhnglx

    class AddNameToUser < ActiveRecord::Migration
        def self.up
            add_column :users, :name, :string
            User.reset_column_information
            User.find(:all).each do |user|
                user.name = user.first_name + ' ' + user.last_name
            end
            remove_column :users, :first_name
            remove_column :users, :last_name
        end

vinhnglx

    class User < ActiveRecord::Base
        validate_inclusion_of :activation_state, :in => ["pending", "active"]

        def self.pending_users
            find :all, :conditions => {:activation_state => 'pending'}
        end

        def self.active_users
            find :all, :conditions => {:activation_state => 'active'}
        end

vinhnglx

    <% unless @contacts.nil?%>
        <% @contacts.each do |c|%>
            <ul>
                <li><%= c[:name]%> :  <%= c[:email]%></li>
            </ul> 
        <%end%>
    <%end%>