Harvest error_messages_for to use on redirect?


I’ve seen this posted a bunch of times but haven’t found an answer. I
want to have multiple forms/pages map to one controller so I don’t
have to duplicate my controller logic, then, render the sending
pages. To do so, I was hoping to just render error_messages_for on
the sending page. But I have learned you lose this on redirect. Is
there a simple way to render error_messages_for to an array or
something then pass that to the submitting form? Has anyone come up
with a workaround for this?