Reset values for dependant derived questions (only layear)

app/models/case_log.rb

@@ -219,6 +219,16 @@ private
     form.invalidated_page_questions(self).each do |question|
       public_send("#{question.id}=", nil) if respond_to?(question.id.to_s)
     end
+
+    dependent_questions = { layear: [{ key: :renewal, value: "No" }] }
+
+    dependent_questions.each do |dependent, conditions|
+      condition_key = conditions.first[:key]
+      condition_value = conditions.first[:value]
+      if public_send("#{condition_key}_changed?") && condition_value == public_send(condition_key) && !public_send("#{dependent}_changed?")
+        self.layear = nil
+      end
+    end
   end
 
   def dynamically_not_required
@@ -256,11 +266,11 @@ private
     end
     self.has_benefits = get_has_benefits
     self.nocharge = household_charge == "Yes" ? "No" : "Yes"
-    self.layear = "Less than 1 year" if renewal == "Yes"
     self.underoccupation_benefitcap = "No" if renewal == "Yes" && year == 2021
     if renewal == "Yes"
       self.homeless = "No"
       self.referral = "Internal transfer"
+      self.layear = "Less than 1 year"
     end
     if needstype == "General needs"
       self.prevten = "Fixed-term private registered provider (PRP) general needs tenancy" if managing_organisation.provider_type == "PRP"

spec/fixtures/forms/2021_2022.json

@@ -725,7 +725,8 @@
                       }
                     }
                   }
-                }
+                },
+                "depends_on":  [{ "renewal": "No" }]
               },
               "time_on_la_waiting_list": {
                 "questions": {

spec/models/case_log_spec.rb

@@ -544,6 +544,35 @@ RSpec.describe CaseLog do
         expect { case_log.update(startdate: Time.zone.local(2015, 1, 1)) }.not_to raise_error
       end
     end
+
+    context "when it changes from a renewal to not a renewal" do
+      let(:case_log) { FactoryBot.create(:case_log) }
+
+      it "resets inferred layear value" do
+        case_log.update!({ renewal: "Yes" })
+
+        record_from_db = ActiveRecord::Base.connection.execute("select layear from case_logs where id=#{case_log.id}").to_a[0]
+        expect(record_from_db["layear"]).to eq(2)
+        expect(case_log["layear"]).to eq("Less than 1 year")
+
+        case_log.update!({ renewal: "No" })
+        record_from_db = ActiveRecord::Base.connection.execute("select layear from case_logs where id=#{case_log.id}").to_a[0]
+        expect(record_from_db["layear"]).to eq(nil)
+        expect(case_log["layear"]).to eq(nil)
+      end
+    end
+
+    context "when it is not a renewal" do
+      let(:case_log) { FactoryBot.create(:case_log) }
+
+      it "saves layear value" do
+        case_log.update!({ renewal: "No", layear: "1 year but under 2 years" })
+
+        record_from_db = ActiveRecord::Base.connection.execute("select layear from case_logs where id=#{case_log.id}").to_a[0]
+        expect(record_from_db["layear"]).to eq(7)
+        expect(case_log["layear"]).to eq("1 year but under 2 years")
+      end
+    end
   end
 
   describe "paper trail" do

spec/models/form_spec.rb

@@ -131,7 +131,7 @@ RSpec.describe Form, type: :model do
 
   describe "invalidated_page_questions" do
     context "when dependencies are not met" do
-      let(:expected_invalid) { %w[la_known cbl conditional_question_no_second_question dependent_question declaration] }
+      let(:expected_invalid) { %w[la_known cbl conditional_question_no_second_question dependent_question layear declaration] }
 
       it "returns an array of question keys whose pages conditions are not met" do
         expect(form.invalidated_page_questions(case_log).map(&:id).uniq).to eq(expected_invalid)
@@ -139,7 +139,7 @@ RSpec.describe Form, type: :model do
     end
 
     context "with two pages having the same question and only one has dependencies met" do
-      let(:expected_invalid) { %w[la_known conditional_question_no_second_question dependent_question declaration] }
+      let(:expected_invalid) { %w[la_known conditional_question_no_second_question dependent_question layear declaration] }
 
       it "returns an array of question keys whose pages conditions are not met" do
         case_log["preg_occ"] = "No"