old-holivud2/db/data_migrations/20200827095745_migrate_material_photos_to_files.rb

class MigrateMaterialPhotosToFiles < ActiveRecord::DataMigration
  def up
    photos = ActiveStorage::Attachment.where(name: "photos", record_type: "MaterialRelease")

    photos.each do |photo|
      photo.update(name: "files")
    end
  end
end