Display all errors for the page

app/controllers/form_controller.rb

@@ -31,6 +31,7 @@ class FormController < ApplicationController
         pages_requiring_update = pages_requiring_update(shown_page_ids_with_unanswered_questions_before_update)
         redirect_to(successful_redirect_path(pages_requiring_update))
       else
+        @log.valid? if mandatory_questions_with_no_response.any?
         mandatory_questions_with_no_response.map do |question|
           @log.errors.add question.id.to_sym, question.unanswered_error_message, category: :not_answered
         end

spec/requests/form_controller_spec.rb

@@ -719,6 +719,34 @@ RSpec.describe FormController, type: :request do
           end
         end
 
+        context "with invalid multiple question answers" do
+          let(:page) { Capybara::Node::Simple.new(response.body) }
+          let(:page_id) { "rent" }
+          let(:params) do
+            {
+              id: lettings_log.id,
+              lettings_log: {
+                page: page_id,
+                "period" => 10,
+                "supcharg" => 1_000_000,
+              },
+            }
+          end
+
+          before do
+            allow(Rails.logger).to receive(:info)
+          end
+
+          it "shows not answered and invalid answer errors at the same time" do
+            post "/lettings-logs/#{lettings_log.id}/#{page_id.dasherize}", params: params
+            expect(page).to have_content("There is a problem")
+            expect(page).to have_content("Support Charge must be between 0 and 300.")
+            expect(page).to have_content("You must answer basic rent.")
+            expect(page).to have_content("You must answer personal service charge.")
+            expect(page).to have_content("You must answer service charge.")
+          end
+        end
+
         context "with invalid organisation answers" do
           let(:page) { Capybara::Node::Simple.new(response.body) }
           let(:managing_organisation) { create(:organisation) }