Update another record on after_save on model

campaign.rb

after_save :bid_adjusts


def bid_adjusts
    unless @old_exclusive_campaign.nil?
      campaign = Campaign.find(@old_exclusive_campaign.id)
      campaign.update_attributes(exclusivity: false)
      campaign.save
    end
end

describe "once an exclusive campaign is created" do
      context "and this created (new) campaign take off the exclusivity from another (old) campaign" do
        it "should set to false the exclusivity field of the old campaign", run: true do
          old_campaign = FactoryGirl.create(:campaign_exclusive, name: "my campaign", bid: 3)
          FactoryGirl.create(:campaign_exclusive, bid: 4)

          old_campaign.exclusivity.should be_false
        end
      end
    end

describe "once an exclusive campaign is created" do
  context "takes over exclusivity from an old campaign" do
    let(:old_campaign) { FactoryGirl.create(:campaign_exclusive, :name => "Old Exclusive", :bid => 3) }

    it "should set to false the exclusivity field of old campaign", run: true do
      FactoryGirl.create(:campaign_exclusive, bid: 4)
      # may or may not need to do old_campaign.reload
      old_campaign.exclusivity.should be_false
    end
  end
end

I don't know if you need to reload the old_campaign object... as we're using let