Rails - Jul 2005 - index and DoubleRenderError

Hello all,

I''m attempting to deal with some DoubleRenderError exceptions and am
looking for advice on how to handle a form submitted by a default
action.

I have a controller with:

def index
  do_something
  render do_something
end

def do_something
  # some code which determines if a form was submitted successfully
  if success
    redirect_to :action => "report_success"
  end
end

And within the do_something view:

<%= start_form_tag %>

The DoubleRenderError exception occurs when a user submits the form. 
Rails does the do_something action''s redirect_to, then attempts to do
the index action''s render.  I believe this is because the
start_form_tag uses the default action (index) instead of the actual
action that was used to generate the view.  Without explicitly setting
the action in the view, is there some other way to overcome this
exception?

Thanks.

-- 
Dennis Sutch
dennis-+mObuC4wx48AvxtiuMwx3w@public.gmane.org

> I''m attempting to deal with some DoubleRenderError exceptions and
am
> looking for advice on how to handle a form submitted by a default
> action.
> 
> I have a controller with:
> 
> def index
>   do_something
>   render do_something
> end
> 
> def do_something
>   # some code which determines if a form was submitted successfully
>   if success
>     redirect_to :action => "report_success"
>   end
> end
> 
> And within the do_something view:
> 
> <%= start_form_tag %>
> 
> The DoubleRenderError exception occurs when a user submits the form.
> Rails does the do_something action''s redirect_to, then attempts to
do
> the index action''s render.  I believe this is because the
> start_form_tag uses the default action (index) instead of the actual
> action that was used to generate the view.  Without explicitly setting
> the action in the view, is there some other way to overcome this
> exception?
Following Jamis Buck''s advice at
http://jamis.jamisbuck.org/articles/2005/07/08/rails-tip-of-the-day,
you should either return after redirects/renders, or check the
performed? value.  Since you have your redirect in another method,
returning won''t necessarily help. It will still call the render below
it.

def index
 do_something
 render(do_something) unless performed?
end

def do_something
 # some code which determines if a form was submitted successfully
 if success
   redirect_to :action => "report_success"
 end
end


-- 
rick
http://techno-weenie.net