RSpec matcher to check if an ActiveRecord exists in the database

Copydescribe Ticket do
  describe '.purge_expired' do
    fresh_ticket = Ticket.create(:expiry => Date.tomorrow)
    expired_ticket = Ticket.create(:expiry => Date.yesterday)
    Ticket.purge_expired
    fresh_ticket.should exist_in_database
    expired_ticket.should_not exist_in_database
  end
end

CopySpec::Matchers.define :exist_in_database do

  match do |actual|
    actual.class.exists?(actual.id)
  end

end