rails-gems-blog-snippet-7.rb

class Travel < ActiveRecord::Base
    belongs_to :expenses_claim
    has_many   :travel_expenses
    accepts_nested_attributes_for :travel_expenses, allow_destroy: true
    
    validates :end_date, presence: true, date: { :after_or_equal_to => :start_date, message: "must be after or equal to start date."}
    validates :end_date, presence: true, date: { :before_or_equal_to => Proc.new { Time.now }, message: "must be today #{(Date.today).to_s} or before." }, on: :create
end