Fixed derived?

app/models/form/lettings/questions/person_partner.rb

@@ -41,9 +41,7 @@ class Form::Lettings::Questions::PersonPartner < ::Form::Question
 
   def hidden_in_check_answers?(log, _current_user = nil)
     if form.start_year_2026_or_later?
-      (2...@person_index).any? do |i|
-        log["relat#{i}"] == "P"
-      end
+      log.is_an_earlier_person_partner(@person_index)
     else
       false
     end

app/models/lettings_log.rb

@@ -408,9 +408,19 @@ class LettingsLog < Log
   end
 
   def is_partner_inferred?(person_index)
+    is_person_under_16(person_index) || is_an_earlier_person_partner(person_index)
+  end
+
+  def is_person_under_16(person_index)
     public_send("age#{person_index}") && public_send("age#{person_index}") < 16
   end
 
+  def is_an_earlier_person_partner(person_index)
+    (2...person_index).any? do |i|
+      public_send("relat#{i}") == "P"
+    end
+  end
+
   def age_changed_from_below_16(person_index)
     public_send("age#{person_index}_was") && public_send("age#{person_index}_was") < 16
   end

spec/models/form/lettings/questions/person_partner_spec.rb

@@ -133,6 +133,10 @@ RSpec.describe Form::Lettings::Questions::PersonPartner, type: :model do
         it "has the correct hidden_in_check_answers?" do
           expect(question.hidden_in_check_answers?(log)).to eq(false)
         end
+
+        it "is not marked as derived" do
+          expect(question.derived?(log)).to be false
+        end
       end
 
       context "and in 2026", metadata: { year: 26 } do
@@ -141,6 +145,10 @@ RSpec.describe Form::Lettings::Questions::PersonPartner, type: :model do
         it "has the correct hidden_in_check_answers?" do
           expect(question.hidden_in_check_answers?(log)).to eq(true)
         end
+
+        it "is marked as derived" do
+          expect(question.derived?(log)).to be true
+        end
       end
     end
 
@@ -153,6 +161,10 @@ RSpec.describe Form::Lettings::Questions::PersonPartner, type: :model do
         it "has the correct hidden_in_check_answers?" do
           expect(question.hidden_in_check_answers?(log)).to eq(false)
         end
+
+        it "is not marked as derived" do
+          expect(question.derived?(log)).to be false
+        end
       end
 
       context "and in 2026", metadata: { year: 26 } do
@@ -161,6 +173,10 @@ RSpec.describe Form::Lettings::Questions::PersonPartner, type: :model do
         it "has the correct hidden_in_check_answers?" do
           expect(question.hidden_in_check_answers?(log)).to eq(false)
         end
+
+        it "is not marked as derived" do
+          expect(question.derived?(log)).to be false
+        end
       end
     end
   end
@@ -185,6 +201,10 @@ RSpec.describe Form::Lettings::Questions::PersonPartner, type: :model do
         it "has the correct hidden_in_check_answers?" do
           expect(question.hidden_in_check_answers?(log)).to eq(false)
         end
+
+        it "is not marked as derived" do
+          expect(question.derived?(log)).to be false
+        end
       end
 
       context "and in 2026", metadata: { year: 26 } do
@@ -193,6 +213,10 @@ RSpec.describe Form::Lettings::Questions::PersonPartner, type: :model do
         it "has the correct hidden_in_check_answers?" do
           expect(question.hidden_in_check_answers?(log)).to eq(true)
         end
+
+        it "is marked as derived" do
+          expect(question.derived?(log)).to be true
+        end
       end
     end
 
@@ -205,6 +229,10 @@ RSpec.describe Form::Lettings::Questions::PersonPartner, type: :model do
         it "has the correct hidden_in_check_answers?" do
           expect(question.hidden_in_check_answers?(log)).to eq(false)
         end
+
+        it "is not marked as derived" do
+          expect(question.derived?(log)).to be false
+        end
       end
 
       context "and in 2026", metadata: { year: 26 } do
@@ -213,6 +241,10 @@ RSpec.describe Form::Lettings::Questions::PersonPartner, type: :model do
         it "has the correct hidden_in_check_answers?" do
           expect(question.hidden_in_check_answers?(log)).to eq(false)
         end
+
+        it "is not marked as derived" do
+          expect(question.derived?(log)).to be false
+        end
       end
     end
   end