do not reset questions that have selected answer options

app/models/case_log.rb

@@ -213,14 +213,18 @@ private
                   end
   end
 
-  def reset_invalidated_dependent_fields!
-    return unless form
-
+  def reset_not_routed_questions
     form.invalidated_page_questions(self).each do |question|
-      public_send("#{question.id}=", nil) if respond_to?(question.id.to_s)
+      enabled = form.enabled_page_questions(self)
+      contains_selected_answer_option = enabled.map(&:id).include?(question.id) && enabled.find { |q| q.id == question.id }.answer_options.values.map { |x| x["value"] }.include?(public_send(question.id))
+      unless contains_selected_answer_option
+        public_send("#{question.id}=", nil) if respond_to?(question.id.to_s)
+      end
     end
+  end
 
-    dependent_questions = { layear: [{ key: :renewal, value: "No" }] }
+  def reset_derived_questions
+    dependent_questions = { layear: [{ key: :renewal, value: "No" }], homeless: [{ key: :renewal, value: "No" }] }
 
     dependent_questions.each do |dependent, conditions|
       condition_key = conditions.first[:key]
@@ -231,6 +235,13 @@ private
     end
   end
 
+  def reset_invalidated_dependent_fields!
+    return unless form
+
+    reset_not_routed_questions
+    reset_derived_questions
+  end
+
   def dynamically_not_required
     (form.invalidated_questions(self) + form.readonly_questions).map(&:id).uniq
   end

app/models/form.rb

@@ -116,9 +116,12 @@ class Form
   def invalidated_page_questions(case_log)
     # we're already treating address fields as a special case and reset their values upon saving a case_log
     address_questions = %w[postcode_known la previous_postcode_known prevloc property_postcode previous_postcode]
+    invalidated_pages(case_log).flat_map(&:questions).reject { |q| address_questions.include?(q.id) } || []
+  end
+
+  def enabled_page_questions(case_log)
     pages_that_are_routed_to = pages.select { |p| p.routed_to?(case_log) }
-    enabled_question_ids = pages_that_are_routed_to.flat_map(&:questions).map(&:id) || []
-    invalidated_pages(case_log).flat_map(&:questions).reject { |q| enabled_question_ids.include?(q.id) || address_questions.include?(q.id) } || []
+    pages_that_are_routed_to.flat_map(&:questions) || []
   end
 
   def invalidated_conditional_questions(case_log)

spec/fixtures/forms/2021_2022.json

@@ -396,9 +396,6 @@
                     "answer_options": {
                       "0": {
                         "value": "Yes"
-                      },
-                      "1": {
-                        "value": "No"
                       }
                     }
                   }

spec/models/case_log_spec.rb

@@ -532,9 +532,17 @@ RSpec.describe CaseLog do
     context "with two pages having the same question key, only one's dependency is met" do
       let(:case_log) { FactoryBot.create(:case_log, :in_progress, cbl: "Yes", preg_occ: "No") }
 
-      it "does not clear the answer" do
+      it "does not clear the value for answers that apply to both pages" do
         expect(case_log.cbl).to eq("Yes")
       end
+
+      it "does clear the value for answers that do not apply for invalidated page" do
+        case_log.update!({ wchair: "Yes", sex2: "Female", age2: 33 })
+        case_log.update!({ cbl: "No"  })
+        case_log.update!({ preg_occ: "Yes" })
+
+        expect(case_log.cbl).to eq(nil)
+      end
     end
 
     context "when the case log does not have a valid form set yet" do
@@ -573,6 +581,7 @@ RSpec.describe CaseLog do
         expect(case_log["layear"]).to eq("1 year but under 2 years")
       end
     end
+
   end
 
   describe "paper trail" do

spec/models/form_spec.rb

@@ -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 layear 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
         case_log["preg_occ"] = "No"