redmine/db/migrate/20170302015225_change_attachments_digest_limit_to_64.rb

class ChangeAttachmentsDigestLimitTo64 < ActiveRecord::Migration[4.2]
  def up
    change_column :attachments, :digest, :string, limit: 64
  end
  def down
    change_column :attachments, :digest, :string, limit: 40
  end
end