Flash messages supported with redirects?

[Marcel Overdijk]

I'm using flashes successfully using 'simple' renderings like:

def index(self):

        self.session.add_flash('Some message')

        self.render_response('index.html')

but when I use it in combination with a redirect the flashes seem to get lost, e.g.

def save(self):

    # do stuff

    self.session.add_flash('Some message')

    self.redirect_to('some_template')

I'm using Jinja2 and are providing the flashes to the templates as follows:

    def render_response(self, _template, **context):

        ctx = {

            'flashes': self.session.get_flashes(),

            'session': self.session

        }

        ctx.update(context)

        rv = self.jinja2.render_template(_template, **ctx)

        self.response.write(rv)

Am I doing something wrong or are flashes not supported with redirects?

Cheers,

Marcel

[Marcel Overdijk]

I guess the problem was on my site.

The code I mentioned was simplified.

The actual code I was using was:

    def save(self):

        form = ProductForm(self.request.POST)

        if form.validate():

            product = Product()

            # store values..

            product.put()

            self.session.add_flash('Product %s is created' % product.code)

            self.redirect_to('show-product', id=product.key.id())

        self.render_response('product/create.html', form=form)

I thought the self.redirect_to would 'skip' the self.render_response which was not the case.

I think it was rendering on the 'background' accessing the flash and thus making it empty.

When I change the code to the one below it works.

    def save(self):

        form = ProductForm(self.request.POST)

        if form.validate():

            product = Product()

            # store values..

            product.put()

            self.session.add_flash('Product %s is created' % product.code)

            self.redirect_to('show-product', id=product.key.id())

        else:

            self.render_response('product/create.html', form=form)