Merge pull request #6046 from nhsuk/alistair/fix-pending-changes-batch-id

Add data migration to refactor `batch_id` in pending changes

Author: alistair-white-horne-tng

lib/tasks/rename_pending_changes_batch_id.rake

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+namespace :data_migration do
+  desc "Renames all the pending changes `batch_id`s to `batch_number`s"
+  task rename_pending_changes_batch_id: :environment do
+    VaccinationRecord
+      .where("pending_changes ? 'batch_id'")
+      .find_each do |record|
+        record.pending_changes["batch_number"] = record.pending_changes.delete(
+          "batch_id"
+        )
+        record.save!(touch: false)
+      end
+  end
+end