Add recalculate lar values task

lib/tasks/recalculate_lar_values.rake

@@ -0,0 +1,13 @@
+desc "Forces to recalculate lar values for affordable rent types and clears irrelevant lar values"
+task recalculate_lar_values: :environment do
+  LettingsLog.exportable.where(rent_type: [1, 2], lar: nil).each do |log| # lar was never set
+    Rails.logger.info("Could not update lar for LettingsLog #{log.id}") unless log.update(values_updated_at: Time.zone.now)
+  end
+  LettingsLog.exportable.where(rent_type: 1).where.not(lar: 2).each do |log| # lar was set wrong
+    Rails.logger.info("Could not update lar for LettingsLog #{log.id}") unless log.update(values_updated_at: Time.zone.now)
+  end
+  LettingsLog.exportable.where(rent_type: 2).where.not(lar: 1).each do |log| # lar was set wrong
+    Rails.logger.info("Could not update lar for LettingsLog #{log.id}") unless log.update(values_updated_at: Time.zone.now)
+  end
+  LettingsLog.exportable.where.not(rent_type: [1, 2]).where.not(lar: nil).update_all(lar: nil) # lar was set to 2 but should never have been set
+end

spec/lib/tasks/recalculate_lar_values_spec.rb

@@ -0,0 +1,100 @@
+require "rails_helper"
+require "rake"
+
+RSpec.describe "recalculate_lar_values" do
+  describe ":recalculate_lar_values", type: :task do
+    subject(:task) { Rake::Task["recalculate_lar_values"] }
+
+    before do
+      Rake.application.rake_require("tasks/recalculate_lar_values")
+      Rake::Task.define_task(:environment)
+      task.reenable
+    end
+
+    context "when the rake task is run" do
+      let!(:lettings_log) { create(:lettings_log, :completed, values_updated_at: nil) }
+
+      it "updates lar to nil if it's not afordable rent or london afordable rent and lar is 1 but does not set it to export" do
+        lettings_log.lar = 1
+        lettings_log.rent_type = 3
+        lettings_log.save!(validate: false)
+        task.invoke
+        lettings_log.reload
+        expect(lettings_log.lar).to eq(nil)
+        expect(lettings_log.values_updated_at).to be_nil
+      end
+
+      it "updates lar to nil if it's not afordable rent or london afordable rent and lar is 2 but does not set it to export" do
+        lettings_log.lar = 2
+        lettings_log.rent_type = 4
+        lettings_log.save!(validate: false)
+        task.invoke
+        lettings_log.reload
+        expect(lettings_log.lar).to eq(nil)
+        expect(lettings_log.values_updated_at).to be_nil
+      end
+
+      it "does not update lar if it's not london afordable rent or affordable rent and lar is nil" do
+        lettings_log.lar = nil
+        lettings_log.rent_type = 3
+        lettings_log.save!(validate: false)
+        task.invoke
+        lettings_log.reload
+        expect(lettings_log.lar).to eq(nil)
+        expect(lettings_log.values_updated_at).to be_nil
+      end
+
+      it "updates lar to 1 if it's london afordable rent and lar is currently nil" do
+        lettings_log.lar = nil
+        lettings_log.rent_type = 2
+        lettings_log.save!(validate: false)
+        task.invoke
+        lettings_log.reload
+        expect(lettings_log.lar).to eq(1)
+        expect(lettings_log.values_updated_at).not_to be_nil
+      end
+
+      it "updates lar to 1 if it's london afordable rent and lar is currently 2" do
+        lettings_log.lar = 2
+        lettings_log.rent_type = 2
+        lettings_log.save!(validate: false)
+        task.invoke
+        lettings_log.reload
+        expect(lettings_log.lar).to eq(1)
+        expect(lettings_log.values_updated_at).not_to be_nil
+      end
+
+      it "updates lar to 2 if it's afordable rent and lar is currently nil" do
+        lettings_log.lar = nil
+        lettings_log.rent_type = 1
+        lettings_log.save!(validate: false)
+        task.invoke
+        lettings_log.reload
+        expect(lettings_log.lar).to eq(2)
+        expect(lettings_log.values_updated_at).not_to be_nil
+      end
+
+      it "updates lar to 2 if it's afordable rent and lar is currently 1" do
+        lettings_log.lar = 1
+        lettings_log.rent_type = 1
+        lettings_log.save!(validate: false)
+        task.invoke
+        lettings_log.reload
+        expect(lettings_log.lar).to eq(2)
+        expect(lettings_log.values_updated_at).not_to be_nil
+      end
+
+      it "does not update lar if a different validation is triggering" do
+        lettings_log.lar = 1
+        lettings_log.rent_type = 1
+        lettings_log.postcode_full = "invalid"
+        lettings_log.save!(validate: false)
+        expect(Rails.logger).to receive(:info).with("Could not update lar for LettingsLog #{lettings_log.id}")
+        task.invoke
+        lettings_log.reload
+        expect(lettings_log.lar).to eq(1)
+        expect(lettings_log.values_updated_at).to be_nil
+      end
+    end
+  end
+end