Merged in CHOUETTE-3087-improve-migration-time (pull request #1540)

CHOUETTE-3087 Migration Stop Area fare_code into Fare Zone by Workgroup

Approved-by: Luc Donnet

Author: albanpeignier

db/migrate/20230907104115_remove_fare_code_from_stop_areas.rb

@@ -1,20 +1,34 @@
+# frozen_string_literal: true
+
 class RemoveFareCodeFromStopAreas < ActiveRecord::Migration[5.2]
   def change
     on_public_schema_only do
-      Chouette::StopArea.where.not(fare_code: nil).includes(stop_area_provider: {workbench: :workgroup}).find_each do |stop_area|
-        stop_area_provider = stop_area.stop_area_provider
-        workbench = stop_area_provider.workbench
-        workgroup = workbench.workgroup
+      impacted_workgroup_ids = Chouette::StopArea.where.not(fare_code: nil).joins(stop_area_provider: :workbench).distinct.pluck(:workgroup_id)
+      # Load every impacted Workgroup
+      impacted_workgroups = Workgroup.where(id: impacted_workgroup_ids)
 
-        fare_provider = workbench.default_fare_provider
-        code_space = workgroup.code_spaces.default
-        value = stop_area.fare_code
+      impacted_workgroups.each do |workgroup|
+        # .. to avoid Workgroup loading in loop :(
+        CustomFieldsSupport.within_workgroup(workgroup) do
+          code_space = workgroup.code_spaces.default
+          stop_areas_with_fare_code = workgroup.stop_area_referential.stop_areas
+                                        .where.not(fare_code: nil).includes(stop_area_provider: :workbench)
 
-        zone = fare_provider.fare_zones.first_or_create_by_code(code_space, value) do |zone|
-          zone.name = value
-        end
+          # Migrate all Workgroup StopAreas
+          stop_areas_with_fare_code.find_each do |stop_area|
+            stop_area_provider = stop_area.stop_area_provider
+            workbench = stop_area_provider.workbench
+            fare_provider = workbench.default_fare_provider
+
+            value = stop_area.fare_code
 
-        stop_area.stop_area_zones.create(zone: zone)
+            zone = fare_provider.fare_zones.first_or_create_by_code(code_space, value) do |zone|
+              zone.name = value
+            end
+
+            stop_area.stop_area_zones.create(zone: zone)
+          end
+        end
       end
 
       remove_column :stop_areas, :fare_code