041 Conditional Validations

railscast-041-conditional-validations

class User < ActiveRecord::Base
  validates_presence_of :password, if: :should_validate_password?
  validates_presence_of :country
  validates_presence_of :state, if: :in_us?
  attr_accessor :updating_password
  
  def in_us?
    country == 'US'
  end
  
  def should_validate_password?
    updating_password || new_record?
  end
end

# in controller
@user.updating_passsword = true
@user.save

@user.save(false)