company_observer.rb

class CompanyObserver < ActiveRecord::Observer
  observe Company

  def after_create(company)
    unless company.current_issue
      Issue.create!(
        :title => "Создана компания #{company.title}",
        :source => company
      )
    end
  end

  def after_update(company)
    unless company.blocked?
      Issue.create!(
        :title => "Изменена компания #{company.title}",
        :source => company
      )
    end
  end
end