What is the "Rails Way" to create the related row at the time the other row is created in Ruby on Rails

Question

I have two tables: Lessons and Pages

• lessons "has_many" pages
• pages "belongs_to" lessons

When a new lesson is created I want the first page to be created at the same time. The first page will have:

• the lesson_id column equal to the newly created lessons id
• the title column equal to the newly created lessons title

Answer 1

Something like this will do the trick:

class Lesson < ActiveRecord::Base
  has_many :pages
  before_create :create_first_page

  def create_first_page
    if pages.empty?
      pages.build(:title => title)
    end
  end
end