On Aug 12, 3:20 am, Mark Thomas <[email protected]> wrote:
> Thanks Frederick for looking at my issue.
>
> Apparently I don't have a full understanding of how the AJAX request
> interacts with (or I guess doesn't interact with) the form_for...
Forget about the ajaxness of it. If you had a page with a form and you
followed a link from that page you wouldn't expect the form builder
from the first page to be hanging around when you render the second
page. If you want to use the form builder version of a helper you just
need to create a new form builder for the template that gets rendered
for the ajax request (you can use fields_for to create a form builder
without actually creating <form> tags)
Fred
> So is the basic idea of what I'm attempting completely wrong or is
> there some slight modification I can do to pull it off?
> Basically, I have a form where I want to create a new listing record -
> but I want the fields to be restricted to values stored in the
> automodels Model in the database (and the model drop-down to be
> filtered based on the make selected).
> From what I've been reading, the best way to do the "dynamic select"
> is using AJAX. However, I guess the collection_selects are never
> inside a form in the examples I've read?
>
> I'm open to any suggestions from the experts here - even if it means
> overhauling the whole thing... :-)
>
> On Aug 11, 3:54 am, Frederick Cheung <[email protected]>
> wrote:
>
>
>
> > On Aug 11, 2:50 am, Mark Thomas <[email protected]> wrote:
>
> > > Hello -
>
> > > ActionView::TemplateError (undefined local variable or method `f' for
> > > #<ActionView::Base:0xb6e7b2f4>) on line #1 of app/views/listings/
> > > _automodels.html.erb:
> > > <%= f.collection_select :model, @automodels, :model, :model, {:prompt
> > > => "-Select a Make First-"} %>
>
> > > This leads me to believe that the "f" variable the rest of the fields
> > > in the form_for are using is not available to the newly-replaced
> > > "collection_select", but I'm not sure why?
>
> > Because that f referred to a form builder object created by form_for.
> > You're in a different scope to when you rendered the original form, in
> > a different request, with a different instance of the controller,
> > possibly on a different mongrel or even a different server. The form
> > builder isn't going to magically appear.
>
> > Fred
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