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class AddFlagToSomeModels < ActiveRecord::Migration

  def self.up
    add_column :some_models, :flag, :boolean, :default => true, :null => false
    SomeModel.first.update_attribute(:flag,  false)
  end

  def self.down
    remove_column :some_models, :active
  end

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#routes.rb
resources :users

#spec.rb
before do
  @user = User.new(:name => "fakename")
  @user.save
end

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u = User.create!(:name => "user1", :adderss => "address1", :current_job => "job1")

u.address = "address2"
u.current_job = "job2"

u.current_job_changed? # => true
u.address_changed? # => true
u.changed? # => true
u.changed # => ['address', 'current_job']

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#Gemfile
    gem 'trackit'

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class User < ActiveRecord::Base
  attr_accessible :name
  has_many :accounts
end

class Account < ActiveRecord::Base
  attr_accessible :kind, :user_id
  belongs_to :user
end

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  has_many :accounts do
    def <<(account)
      account.kind = "UserAccount"
      proxy_association.owner.accounts += [account]
    end
  end

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  has_many :accounts do
    def recent
      where('accounts.created_at > ?', 5.days.ago)
    end
  end

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module AccountOfUser
  def <<(account)
    account.kind = "UserAccount"
    proxy_association.owner.accounts += [account]
  end
end

class User < ActiveRecord::Base
  attr_accessible :name
  has_many :accounts, :extend => AccountOfUser

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this.model.save()
.always(function() {
  // Do Something here
});

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window.FormView = Backbone.View.extend({
  events: { "tap #submit_form_button" : "submitForm" },
  .
  .
  .
  submitForm: function(){
    var form =  $("#my_form");
    form.validate({
        rules:{...},
        messages:{...},