project.rb

class Project < ActiveRecord::Base
  acts_as_indexed :fields => [
    :title, :description, :website
  ]

  validates_presence_of :title, :description
  validates_uniqueness_of :title

  acts_as_nested_set

  has_friendly_id :title, :use_slug => true

  belongs_to :page
  belongs_to :image

  after_create :add_linked_page
  after_update :update_linked_page
  before_destroy :remove_linked_page

protected

  def add_linked_page
    return if self.page.present?

    self.page = Page.create(
      :title => self.title,
      :link_url => "/projects/#{self.to_param}",
      :deletable => false,
      :parent => self.parent ? self.parent.page : Page.find_by_link_url('/projects')
    )
    self.save!
  end

  def update_linked_page
    return unless self.page.present?

    self.page.attributes = {
      :title => self.title,
      :link_url => "/projects/#{self.to_param}",
      :parent => self.parent ? self.parent.page : Page.find_by_link_url('/projects')
    }
    self.page.save!
  end

  def remove_linked_page
    self.page.destroy! if self.page.present?
  end
end