Very useful information.
Thanks Jonathan
On 25 feb, 17:11, Jonathan Lundell <jlund...@pobox.com> wrote:
> On Feb 25, 2011, at 2:02 AM, SergeyPo wrote:
>
>
>
> > Hello everyone!
>
> > I want to do something like:
>
> > def selector():
> > try:
> > x = db.headers[request.vars.ID]
> > if x is None:
> > response.flash = T('ID incorrect')
> > redirect(URL(r=request, f='index', args=(request.args[1])))
> > except:
> > response.flash = T('ID incorrect')
> > redirect(URL(r=request, f='headers', args=(request.args[1])))
>
> > response.flash does not keep its value when you redirect. Is it
> > possible to fix or workaround?
>
> As others have already said, you want to use session.flash here. It's useful
> to understand why.
>
> Redirect is itself a response, sending a redirection code and the new URL to
> the requesting browser. When that happens, everything in response, including
> response.flash, is discarded--the redirection becomes the entire response.
>
> On every request from the browser, web2py initializes a new response
> dictionary (along with request and some other stuff). It sets response.flash
> = session.flash, and then sets session.flash = None. So anything you store in
> session.flash is used as response.flash for the *next* request/response,
> which is exactly what you want when you're calling redirect.
