update updated_at column when updating incref (#1838)

lib/tasks/correct_incref_values.rake

@@ -1,6 +1,6 @@
 desc "Alter incref values for non imported lettings logs in the database"
 task correct_incref_values: :environment do
-  LettingsLog.where(old_id: nil, net_income_known: 0).update_all(incref: 0)
-  LettingsLog.where(old_id: nil, net_income_known: 1).update_all(incref: 2)
-  LettingsLog.where(old_id: nil, net_income_known: 2).update_all(incref: 1)
+  LettingsLog.where(old_id: nil, net_income_known: 0).update_all(incref: 0, updated_at: Time.zone.now)
+  LettingsLog.where(old_id: nil, net_income_known: 1).update_all(incref: 2, updated_at: Time.zone.now)
+  LettingsLog.where(old_id: nil, net_income_known: 2).update_all(incref: 1, updated_at: Time.zone.now)
 end

spec/lib/tasks/correct_incref_values_spec.rb

@@ -39,6 +39,14 @@ RSpec.describe "correct_incref_values" do
         task.invoke
         expect(lettings_log.reload.incref).to eq(1)
       end
+
+      it "updates updated_at value" do
+        lettings_log.updated_at = Time.zone.local(2021, 3, 3)
+        lettings_log.save!(validate: false)
+        expect(lettings_log.updated_at.to_date).to eq(Time.zone.local(2021, 3, 3))
+        task.invoke
+        expect(lettings_log.reload.updated_at.to_date).to eq(Time.zone.today)
+      end
     end
   end
 end