@Kurisu Do you have a working example?
I made some tests and the errors are not showing after the redirect for some reason.
# new
changeset = conn.assigns[:errors] || Context.change_resource(%Resource{})
render(conn, "new.html", changeset: changeset)
# update
conn = %{conn | assigns: Map.merge(conn.assigns, %{:errors => changeset})}
redirect(conn, to: Routes.resource_path(conn, :new))
Update: Seems that the assigns are been cleaned after the redirect. I think that this is not possible without using session.
