如何将此代码转换为原始sql并在rails中使用？因为当我在heroku中部署此代码时,会出现请求超时错误.我认为如果我使用原始sql,这将更快.
@payments = PaymentDetail.joins(:project).order('payment_details.created_at desc')
@payment_errors = PaymentError.joins(:project).order('payment_errors.created_at desc')
@all_payments = (@payments + @payment_errors)