On 2006-07-13, at 15:14 , Martin Emde wrote:
I would expect the opposite of this. A lot of programs may halt a
filter chain because a user is not logged in, set the flash to let
them know "please login first" and then redirect to the login
action which would then display the flash message. If the flash
was swept that wouldn't work any longer.
What Isak said. Here's a quick example. Gerenate an app and create a
test_controller with the following contents, then visit http://
localhost:3000/test/one and follow the links.
class TestController < ApplicationController
FLASH = "<pre><%=
{}.update(flash).to_yaml %><%=
{}.update(flash.instance_variable_get('@used')).to_yaml %></pre>"
before_filter :redir, :only => 'skip'
def one
render :inline => "#{FLASH}1. <%= link_to 'next', :action =>
'skip' %>"
end
def skip
render :inline => "#{FLASH}skip"
end
def two
render :inline => "#{FLASH}2. <%= link_to 'next', :action =>
'three' %>"
end
def three
render :inline => "#{FLASH}3. see..."
end
private
def redir
flash[:foo] = 'bar'
redirect_to :action => 'two'
false
end
end
The first yaml output is the flash. The second is an internal
variable of the flash that keeps track of whether keys have been
"used" or not.
During sweep, unused keys are marked used, and kept in the flash,
used keys are removed from the flash. That's how keys are kept for
one more action, and how you can use flash.keep(:key) to keep a key
but not others.
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