Enable dynamically dependent answer options

app/models/case_log.rb

@@ -477,12 +477,16 @@ private
     (2..8).each do |idx|
       if public_send("age#{idx}") && public_send("age#{idx}") < 16
         self["ecstat#{idx}"] = 9
-      elsif public_send("ecstat#{idx}") == 9 && (public_send("age#{idx}").nil? || public_send("age#{idx}") >= 16)
+      elsif public_send("ecstat#{idx}") == 9 && (public_send("age#{idx}").nil? || public_send("age#{idx}") >= 16) && age_known?(idx)
         self["ecstat#{idx}"] = nil
       end
     end
   end
 
+  def age_known?(person_num)
+    !!public_send("age#{person_num}_known")&.zero?
+  end
+
   def process_postcode_changes!
     self.postcode_full = postcode_full.present? ? postcode_full.upcase.gsub(/\s+/, "") : postcode_full
     process_postcode(postcode_full, "postcode_known", "is_la_inferred", "la")

app/models/form.rb

@@ -146,4 +146,27 @@ class Form
 
     previous_page(page_ids, page_index - 1, case_log)
   end
+
+  def send_chain(arr, case_log)
+    Array(arr).inject(case_log) { |o, a| o.public_send(*a) }
+  end
+
+  def depends_on_met(depends_on, case_log)
+    return true unless depends_on
+
+    depends_on.any? do |conditions_set|
+      conditions_set.all? do |question, value|
+        if value.is_a?(Hash) && value.key?("operator")
+          operator = value["operator"]
+          operand = value["operand"]
+          case_log[question]&.send(operator, operand)
+        else
+          parts = question.split(".")
+          case_log_value = send_chain(parts, case_log)
+
+          value.nil? ? case_log_value == value : !case_log_value.nil? && case_log_value == value
+        end
+      end
+    end
+  end
 end

app/models/form/page.rb

@@ -14,10 +14,12 @@ class Form::Page
     @subsection = subsection
   end
 
+  delegate :form, to: :subsection
+
   def routed_to?(case_log)
     return true unless depends_on || subsection.depends_on
 
-    subsection.enabled?(case_log) && depends_on_met(case_log)
+    subsection.enabled?(case_log) && form.depends_on_met(depends_on, case_log)
   end
 
   def non_conditional_questions
@@ -36,27 +38,4 @@ private
       q.conditional_for.keys if q.type == "radio"
     }.compact
   end
-
-  def send_chain(arr, case_log)
-    Array(arr).inject(case_log) { |o, a| o.public_send(*a) }
-  end
-
-  def depends_on_met(case_log)
-    return true unless depends_on
-
-    depends_on.any? do |conditions_set|
-      conditions_set.all? do |question, value|
-        if value.is_a?(Hash) && value.key?("operator")
-          operator = value["operator"]
-          operand = value["operand"]
-          case_log[question]&.send(operator, operand)
-        else
-          parts = question.split(".")
-          case_log_value = send_chain(parts, case_log)
-
-          value.nil? ? case_log_value == value : !case_log_value.nil? && case_log_value == value
-        end
-      end
-    end
-  end
 end

app/models/form/question.rb

@@ -80,9 +80,9 @@ class Form::Question
     false
   end
 
-  def displayed_answer_options
+  def displayed_answer_options(case_log)
     answer_options.select do |_key, val|
-      !val.is_a?(Hash) || !val["derived"]
+      !val.is_a?(Hash) || !val["depends_on"] || form.depends_on_met(val["depends_on"], case_log)
     end
   end
 
@@ -168,7 +168,7 @@ private
 
   def selected_answer_option_is_derived?(case_log)
     selected_option = answer_options&.dig(case_log[id].to_s.presence)
-    selected_option.is_a?(Hash) && selected_option["derived"]
+    selected_option.is_a?(Hash) && selected_option["depends_on"] && form.depends_on_met(selected_option["depends_on"], case_log)
   end
 
   def has_inferred_display_value?(case_log)

app/views/form/_checkbox_question.html.erb

@@ -6,7 +6,7 @@
     hint: { text: question.hint_text&.html_safe } do %>
     <% after_divider = false %>
 
-    <% question.displayed_answer_options.map do |key, options| %>
+    <% question.displayed_answer_options(@case_log).map do |key, options| %>
       <% if key.starts_with?("divider") %>
       <% after_divider = true %>
       <%= f.govuk_check_box_divider %>

app/views/form/_radio_question.html.erb

@@ -5,7 +5,7 @@
   legend: legend(question, page_header, conditional),
   hint: { text: question.hint_text&.html_safe } do %>
 
-  <% question.displayed_answer_options.map do |key, options| %>
+  <% question.displayed_answer_options(@case_log).map do |key, options| %>
     <% if key.starts_with?("divider") %>
       <%= f.govuk_radio_divider %>
     <% else %>

app/views/form/_select_question.html.erb

@@ -1,7 +1,7 @@
 <%= render partial: "form/guidance/#{question.guidance_partial}" if question.guidance_partial %>
 
 <% selected = @case_log.public_send(question.id) || "" %>
-<% answers = question.displayed_answer_options.map { |key, value| OpenStruct.new(id: key, name: value) } %>
+<% answers = question.displayed_answer_options(@case_log).map { |key, value| OpenStruct.new(id: key, name: value) } %>
   <%= f.govuk_collection_select question.id.to_sym,
     answers,
     :id,

config/forms/2021_2022.json

@@ -1771,7 +1771,10 @@
                     },
                     "9": {
                       "value": "Child under 16",
-                      "derived": true
+                      "depends_on": [
+                        { "age2_known": 1 },
+                        { "age2": { "operator": "<", "operand": 16 } }
+                      ]
                     },
                     "0": {
                       "value": "Other"
@@ -1990,7 +1993,10 @@
                     },
                     "9": {
                       "value": "Child under 16",
-                      "derived": true
+                      "depends_on": [
+                        { "age3_known": 1 },
+                        { "age3": { "operator": "<", "operand": 16 } }
+                      ]
                     },
                     "0": {
                       "value": "Other"
@@ -2206,7 +2212,10 @@
                     },
                     "9": {
                       "value": "Child under 16",
-                      "derived": true
+                      "depends_on": [
+                        { "age4_known": 1 },
+                        { "age4": { "operator": "<", "operand": 16 } }
+                      ]
                     },
                     "0": {
                       "value": "Other"
@@ -2419,7 +2428,10 @@
                     },
                     "9": {
                       "value": "Child under 16",
-                      "derived": true
+                      "depends_on": [
+                        { "age5_known": 1 },
+                        { "age5": { "operator": "<", "operand": 16 } }
+                      ]
                     },
                     "0": {
                       "value": "Other"
@@ -2629,7 +2641,10 @@
                     },
                     "9": {
                       "value": "Child under 16",
-                      "derived": true
+                      "depends_on": [
+                        { "age6_known": 1 },
+                        { "age6": { "operator": "<", "operand": 16 } }
+                      ]
                     },
                     "0": {
                       "value": "Other"
@@ -2836,7 +2851,10 @@
                     },
                     "9": {
                       "value": "Child under 16",
-                      "derived": true
+                      "depends_on": [
+                        { "age7_known": 1 },
+                        { "age7": { "operator": "<", "operand": 16 } }
+                      ]
                     },
                     "0": {
                       "value": "Other"
@@ -3040,7 +3058,10 @@
                     },
                     "9": {
                       "value": "Child under 16",
-                      "derived": true
+                      "depends_on": [
+                        { "age8_known": 1 },
+                        { "age8": { "operator": "<", "operand": 16 } }
+                      ]
                     },
                     "0": {
                       "value": "Other"

config/forms/2022_2023.json

@@ -1769,7 +1769,10 @@
                     },
                     "9": {
                       "value": "Child under 16",
-                      "derived": true
+                      "depends_on": [
+                        { "age2_known": 1 },
+                        { "age2": { "operator": "<", "operand": 16 } }
+                      ]
                     },
                     "0": {
                       "value": "Other"
@@ -1995,7 +1998,10 @@
                     },
                     "9": {
                       "value": "Child under 16",
-                      "derived": true
+                      "depends_on": [
+                        { "age3_known": 1 },
+                        { "age3": { "operator": "<", "operand": 16 } }
+                      ]
                     },
                     "0": {
                       "value": "Other"
@@ -2218,7 +2224,10 @@
                     },
                     "9": {
                       "value": "Child under 16",
-                      "derived": true
+                      "depends_on": [
+                        { "age4_known": 1 },
+                        { "age4": { "operator": "<", "operand": 16 } }
+                      ]
                     },
                     "0": {
                       "value": "Other"
@@ -2438,7 +2447,10 @@
                     },
                     "9": {
                       "value": "Child under 16",
-                      "derived": true
+                      "depends_on": [
+                        { "age5_known": 1 },
+                        { "age5": { "operator": "<", "operand": 16 } }
+                      ]
                     },
                     "0": {
                       "value": "Other"
@@ -2655,7 +2667,10 @@
                     },
                     "9": {
                       "value": "Child under 16",
-                      "derived": true
+                      "depends_on": [
+                        { "age6_known": 1 },
+                        { "age6": { "operator": "<", "operand": 16 } }
+                      ]
                     },
                     "0": {
                       "value": "Other"
@@ -2869,7 +2884,10 @@
                     },
                     "9": {
                       "value": "Child under 16",
-                      "derived": true
+                      "depends_on": [
+                        { "age7_known": 1 },
+                        { "age7": { "operator": "<", "operand": 16 } }
+                      ]
                     },
                     "0": {
                       "value": "Other"
@@ -3080,7 +3098,10 @@
                     },
                     "9": {
                       "value": "Child under 16",
-                      "derived": true
+                      "depends_on": [
+                        { "age8_known": 1 },
+                        { "age8": { "operator": "<", "operand": 16 } }
+                      ]
                     },
                     "0": {
                       "value": "Other"

spec/fixtures/forms/2021_2022.json

@@ -188,7 +188,10 @@
                       },
                       "9": {
                         "value": "Child under 16",
-                        "derived": true
+                        "depends_on": [
+                          { "age2_known": 1 },
+                          { "age2": { "operator": "<", "operand": 16 } }
+                        ]
                       },
                       "1": {
                         "value": "Prefer not to say"

spec/fixtures/softwire_imports/case_logs/0ead17cb-1668-442d-898c-0d52879ff592.xml

@@ -54,8 +54,8 @@
     <P1Eco>6) Not Seeking Work</P1Eco>
     <P1Eth>17 Refused</P1Eth>
     <P1Nat>1 UK national resident in UK</P1Nat>
-    <P2Age override-field="">2</P2Age>
+    <P2Age override-field=""/>
-    <P2AR/>
+    <P2AR>Age_Refused</P2AR>
     <P2Sex override-field="">Male</P2Sex>
     <P2Rel>Child</P2Rel>
     <P2Eco>9) Child under 16</P2Eco>

spec/models/case_log_spec.rb

@@ -1367,7 +1367,7 @@ RSpec.describe CaseLog do
       end
 
       it "correctly resets economic status when age changes from under 16" do
-        household_case_log.update!(age7: 17)
+        household_case_log.update!(age7_known: 0, age7: 17)
         record_from_db = ActiveRecord::Base.connection.execute("select ecstat7 from case_logs where id=#{household_case_log.id}").to_a[0]
         expect(record_from_db["ecstat7"]).to eq(nil)
       end

spec/models/form/question_spec.rb

@@ -118,7 +118,7 @@ RSpec.describe Form::Question, type: :model do
 
     context "when answer options do not include derived options" do
       it "displays all answer options" do
-        expect(question.displayed_answer_options).to match(question.answer_options)
+        expect(question.displayed_answer_options(case_log)).to match(question.answer_options)
       end
     end
 
@@ -132,7 +132,7 @@ RSpec.describe Form::Question, type: :model do
       end
 
       it "does not include those options in the displayed options" do
-        expect(question.displayed_answer_options).to match(expected_answer_options)
+        expect(question.displayed_answer_options(case_log)).to match(expected_answer_options)
       end
 
       it "can still map the value label" do