use the methods dynamically created by active record in all relevant places, removing obsolete methods in teh process.

various tests tweaked to suppor this change.
rake task from another ticket folded into this ticket to prevent merge conflicts

app/components/check_answers_summary_list_card_component.rb

@@ -35,17 +35,13 @@ class CheckAnswersSummaryListCardComponent < ViewComponent::Base
 private
 
   def unanswered_value
-    if bulk_uploaded?
+    if log.creation_method_bulk_upload?
       "<span class=\"app-!-colour-red\">You still need to answer this question</span>".html_safe
     else
       "<span class=\"app-!-colour-muted\">You didn’t answer this question</span>".html_safe
     end
   end
 
-  def bulk_uploaded?
-    log.bulk_upload
-  end
-
   def number_of_buyers
     log[:jointpur] == 1 ? 2 : 1
   end

app/helpers/check_answers_helper.rb

@@ -54,14 +54,10 @@ private
   end
 
   def unanswered_value(log:)
-    if bulk_uploaded?(log:)
+    if log.creation_method_bulk_upload?
       "<span class=\"app-!-colour-red\">You still need to answer this question</span>".html_safe
     else
       "<span class=\"app-!-colour-muted\">You didn’t answer this question</span>".html_safe
     end
   end
-
-  def bulk_uploaded?(log:)
-    log.bulk_upload
-  end
 end

app/helpers/log_actions_helper.rb

@@ -16,7 +16,7 @@ private
 
   def back_button_for(log)
     if log.completed?
-      if log.bulk_uploaded?
+      if log.creation_method_bulk_upload?
         if log.lettings?
           govuk_button_link_to "Back to uploaded logs", resume_bulk_upload_lettings_result_path(log.bulk_upload)
         else

app/models/log.rb

@@ -24,7 +24,7 @@ class Log < ApplicationRecord
     "single log" => 1,
     "bulk upload" => 2,
   }.freeze
-  enum creation_method: CREATION_METHOD
+  enum creation_method: CREATION_METHOD, _prefix: true
 
   scope :visible, -> { where(status: %w[not_started in_progress completed]) }
   scope :exportable, -> { where(status: %w[not_started in_progress completed deleted]) }
@@ -184,10 +184,6 @@ class Log < ApplicationRecord
     end
   end
 
-  def bulk_uploaded?
-    bulk_upload_id.present?
-  end
-
   def collection_closed_for_editing?
     form.edit_end_date < Time.zone.now || older_than_previous_collection_year?
   end

app/services/bulk_upload/lettings/log_creator.rb

@@ -14,7 +14,7 @@ class BulkUpload::Lettings::LogCreator
 
       row_parser.log.blank_invalid_non_setup_fields!
       row_parser.log.bulk_upload = bulk_upload
-      row_parser.log.creation_method = "bulk upload"
+      row_parser.log.creation_method_bulk_upload!
       row_parser.log.skip_update_status = true
       row_parser.log.status = "pending"
       row_parser.log.status_cache = row_parser.log.calculate_status

app/services/bulk_upload/sales/log_creator.rb

@@ -14,7 +14,7 @@ class BulkUpload::Sales::LogCreator
 
       row_parser.log.blank_invalid_non_setup_fields!
       row_parser.log.bulk_upload = bulk_upload
-      row_parser.log.creation_method = "bulk upload"
+      row_parser.log.creation_method_bulk_upload!
       row_parser.log.skip_update_status = true
       row_parser.log.status = "pending"
       row_parser.log.status_cache = row_parser.log.calculate_status

app/services/imports/lettings_logs_field_import_service.rb

@@ -49,10 +49,10 @@ module Imports
         when "Manual Entry"
           @logger.info "lettings log with old id #{old_id} entered manually, no need for update"
         when "Bulk Upload"
-          if log.creation_method == "bulk upload"
+          if log.creation_method_bulk_upload?
             @logger.info "lettings log #{log.id} creation method already set to bulk upload, no need for update"
           else
-            log.update!(creation_method: "bulk upload")
+            log.creation_method_bulk_upload!
             @logger.info "lettings log #{log.id} creation method set to bulk upload"
           end
         end

app/services/imports/sales_logs_field_import_service.rb

@@ -22,10 +22,10 @@ module Imports
         when "Manual Entry"
           @logger.info "sales log with old id #{old_id} entered manually, no need for update"
         when "Bulk Upload"
-          if log.creation_method == "bulk upload"
+          if log.creation_method_bulk_upload?
             @logger.info "sales log #{log.id} creation method already set to bulk upload, no need for update"
           else
-            log.update!(creation_method: "bulk upload")
+            log.creation_method_bulk_upload!
             @logger.info "sales log #{log.id} creation method set to bulk upload"
           end
         end

lib/tasks/creation_method.rake

@@ -0,0 +1,5 @@
+desc "set creation method to bulk upload if a log has a bulk upload id"
+task set_creation_method: :environment do
+  LettingsLog.where.not(bulk_upload_id: nil).each(&:creation_method_bulk_upload!)
+  SalesLog.where.not(bulk_upload_id: nil).each(&:creation_method_bulk_upload!)
+end

spec/components/check_answers_summary_list_card_component_spec.rb

@@ -40,8 +40,7 @@ RSpec.describe CheckAnswersSummaryListCardComponent, type: :component do
       context "when log was created via a bulk upload and has an unanswered question" do
         subject(:component) { described_class.new(questions:, log:, user:) }
 
-        let(:bulk_upload) { build(:bulk_upload, :lettings) }
-        let(:log) { build(:lettings_log, :in_progress, bulk_upload:, age2: 99, startdate: Time.zone.local(2021, 5, 1)) }
+        let(:log) { build(:lettings_log, :in_progress, creation_method: "bulk upload", age2: 99, startdate: Time.zone.local(2021, 5, 1)) }
 
         it "displays tweaked copy in red" do
           expect(rendered).to have_selector("span", class: "app-!-colour-red", text: "You still need to answer this question")

spec/helpers/check_answers_helper_spec.rb

@@ -39,8 +39,7 @@ RSpec.describe CheckAnswersHelper do
   describe "#get_answer_label" do
     context "when unanswered and bulk upload" do
       let(:question) { log.form.questions.sample }
-      let(:bulk_upload) { build(:bulk_upload, :sales) }
-      let(:log) { build(:sales_log, bulk_upload:) }
+      let(:log) { build(:sales_log, creation_method: "bulk upload") }
 
       it "is red" do
         expect(get_answer_label(question, log)).to include("red")

spec/services/imports/lettings_logs_field_import_service_spec.rb

@@ -106,7 +106,7 @@ RSpec.describe Imports::LettingsLogsFieldImportService do
       let(:lettings_log_id) { "166fc004-392e-47a8-acb8-1c018734882b" }
 
       it "logs that bulk upload id does not need setting" do
-        lettings_log.update!(creation_method: "single log")
+        lettings_log.creation_method_single_log!
         expect(logger).to receive(:info).with(/lettings log \d+ creation method set to bulk upload/)
         expect { import_service.update_field(field, remote_folder) }.to change { lettings_log.reload.creation_method }.to "bulk upload"
       end

spec/services/imports/sales_logs_field_import_service_spec.rb

@@ -57,7 +57,7 @@ RSpec.describe Imports::SalesLogsFieldImportService do
       let(:sales_log_filename) { "shared_ownership_sales_log2" }
 
       it "logs that bulk upload id does not need setting" do
-        sales_log.update!(creation_method: "single log")
+        sales_log.creation_method_single_log!
         expect(logger).to receive(:info).with(/sales log \d+ creation method set to bulk upload/)
         expect { import_service.update_field(field, remote_folder) }.to change { sales_log.reload.creation_method }.to "bulk upload"
       end

spec/views/logs/edit.html.erb_spec.rb

@@ -69,7 +69,7 @@ RSpec.describe "logs/edit.html.erb" do
 
     context "when lettings log is bulk uploaded" do
       let(:bulk_upload) { create(:bulk_upload, :lettings) }
-      let(:log) { create(:lettings_log, :completed, bulk_upload:) }
+      let(:log) { create(:lettings_log, :completed, bulk_upload:, creation_method: "bulk upload") }
 
       it "has link 'Back to uploaded logs'" do
         render
@@ -90,7 +90,7 @@ RSpec.describe "logs/edit.html.erb" do
 
     context "when sales log is bulk uploaded" do
       let(:bulk_upload) { create(:bulk_upload, :sales) }
-      let(:log) { create(:sales_log, :completed, bulk_upload:) }
+      let(:log) { create(:sales_log, :completed, bulk_upload:, creation_method: "bulk upload") }
 
       it "has link 'Back to uploaded logs'" do
         render