Redirect after update

app/controllers/form_controller.rb

@@ -37,8 +37,9 @@ class FormController < ApplicationController
         error_attributes = @log.errors.map(&:attribute)
         Rails.logger.info "User triggered validation(s) on: #{error_attributes.join(', ')}"
         @subsection = form.subsection_for_page(@page)
-        restore_error_field_values(@page&.questions)
+        flash[:errors] = @log.errors
-        render "form/page"
+        flash[:log_data] = responses_for_page
+        redirect_to send("#{@log.class.name.underscore}_#{@page.id}_path", @log, { referrer: request.params["referrer"], original_page_id: request.params["original_page_id"], related_question_ids: request.params["related_question_ids"] })
       end
     else
       render_not_found
@@ -79,11 +80,16 @@ class FormController < ApplicationController
       page_id = request.path.split("/")[-1].underscore
       @page = form.get_page(page_id)
       @subsection = form.subsection_for_page(@page)
+
       if @page.routed_to?(@log, current_user) || is_referrer_type?("interruption_screen") || adding_answer_from_check_errors_page?
         if updated_answer_from_check_errors_page?
           @questions = request.params["related_question_ids"].map { |id| @log.form.get_question(id, @log) }
           render "form/check_errors"
         else
+          if flash[:errors].present?
+            restore_previous_errors(flash[:errors])
+            restore_error_field_values(flash[:log_data])
+          end
           render "form/page"
         end
       else
@@ -96,13 +102,21 @@ class FormController < ApplicationController
 
 private
 
-  def restore_error_field_values(questions)
+  def restore_error_field_values(previous_responses)
-    return unless questions
+    return unless previous_responses
 
-    questions.each do |question|
+    previous_responses_to_reset = previous_responses.reject do |key, _|
-      if question&.type == "date" && @log.attributes.key?(question.id)
+      @log.form.get_question(key, @log).type == "date"
-        @log[question.id] = @log.send("#{question.id}_was")
     end
+
+    @log.assign_attributes(previous_responses_to_reset)
+  end
+
+  def restore_previous_errors(previous_errors)
+    return unless previous_errors
+
+    previous_errors.each do |attribute, message|
+      @log.errors.add attribute, message.first
     end
   end
 

spec/requests/form_controller_spec.rb

@@ -582,8 +582,9 @@ RSpec.describe FormController, type: :request do
             allow(Rails.logger).to receive(:info)
           end
 
-          it "re-renders the same page with errors if validation fails" do
+          it "redirects to the same page with errors if validation fails" do
             post "/lettings-logs/#{lettings_log.id}/#{page_id.dasherize}", params: params
+            follow_redirect!
             expect(page).to have_content("There is a problem")
             expect(page).to have_content("Error: What is the tenant’s age?")
           end
@@ -591,6 +592,8 @@ RSpec.describe FormController, type: :request do
           it "resets errors when fixed" do
             post "/lettings-logs/#{lettings_log.id}/#{page_id.dasherize}", params: params
             post "/lettings-logs/#{lettings_log.id}/#{page_id.dasherize}", params: valid_params
+            follow_redirect!
+            expect(page).not_to have_content("There is a problem")
             get "/lettings-logs/#{lettings_log.id}/#{page_id.dasherize}"
             expect(page).not_to have_content("There is a problem")
           end
@@ -616,6 +619,7 @@ RSpec.describe FormController, type: :request do
 
             it "validates the date correctly" do
               post "/lettings-logs/#{lettings_log.id}/#{page_id.dasherize}", params: params
+              follow_redirect!
               expect(page).to have_content("There is a problem")
             end
           end
@@ -693,6 +697,7 @@ RSpec.describe FormController, type: :request do
 
               it "validates the date correctly" do
                 post "/lettings-logs/#{lettings_log.id}/#{page_id.dasherize}", params: params
+                follow_redirect!
                 expect(page).to have_content("There is a problem")
               end
             end
@@ -713,6 +718,7 @@ RSpec.describe FormController, type: :request do
 
               it "validates the date correctly" do
                 post "/sales-logs/#{sales_log.id}/#{page_id.dasherize}", params: params
+                follow_redirect!
                 expect(page).to have_content("There is a problem")
               end
             end
@@ -748,8 +754,9 @@ RSpec.describe FormController, type: :request do
             Timecop.unfreeze
           end
 
-          it "re-renders the same page with errors if validation fails" do
+          it "redirects the same page with errors if validation fails" do
             post "/lettings-logs/#{lettings_log.id}/managing-organisation", params: params
+            follow_redirect!
             expect(page).to have_content("There is a problem")
             expect(page).to have_content("Error: Which organisation manages this letting?")
           end