Rails - May 2006 - Two Models one form

I have setup a basic conference registration form.  Within that form I 
have an optional piece of information that would only be filled out if 
the registrant was a vendor.  Here is my relationship:

Registration has_one :vendor
Vendor belongs_to :registration

I want to be able to send both the vendor information and registration 
information with the same form, but the vendor information might not be 
sent if the registrant wasn''t a vendor.  I have my fields set up for
the
vendor but I don''t think they are right:

<%= select("vendor", "donation", [[''Door
Prize'', ''doorprize''],
[''Monetary donation for door prize'',
''monetary''], [''Sponsor food
event?breakfast ($700)'', ''breakfast''],
[''Sponsor food event?snack
($300)'', ''snack''], [''Sponsor food
event?dinner ($3000)'', ''dinner''],
[''Sponsor entertainment at dinner ($650)'',
''entertainment''] ],
{:include_blank => true})%>

<%= select("vendor", "monetary_donation",
[[''$100'', ''100''], [''$200'',
''200''], [''$300'', ''300''],
[''$400'', ''400''], [''$500'',
''500''], [''$600'',
''600''] ], {:include_blank => true})%>

<%= text_field ''vendor'', ''other'' %>

<%= check_box "vendor", "electricity" %>

I get the error "Vendor expected, got String."  Do I need to manually 
insert the vendor data in the controller? Like this:

@reg = Registration.new(params[:registration])
@reg.vendor.donation = params[:vendor_donation]
@reg.vendor.monetary_donation = params[:vendor_monetary_donation]
@reg.vendor.other = params[:vendor_other]
@reg.vendor.electricity = params[:vendor_electricity]

Or is there an easier way?

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I could be wrong but I think you need to initialize a vendor. i.e:

@reg = Registration.new(params[:registration])
@reg.vendor = Vendor.new
@reg.vendor.donation etc...

-Adam

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Oh, and for your other question you can do:

@reg.vendor = Vendor.new(params[:vendor])

and so long as your params hash is filled, that''ll work fine.

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Adam Bloom wrote:
> Oh, and for your other question you can do:
> 
> @reg.vendor = Vendor.new(params[:vendor])
> 
> and so long as your params hash is filled, that''ll work fine.
Does this relationship assume I have a registration_id field in my 
vendors table?

I do and I think that is right but I can''t remember.

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> Will this not allow me to do validation on *both* models?  It
isn''t
> picking up the validation on one of them.
> 
> Seth
I do believe that is because I am dumb. This is probably what you should 
do:

@reg = Registration.new(params[:registration])
vend = Vendor.new(params[:vendor])
if vendor.save
   @reg.vendor = vend
   if @reg.save
      <normal stuff>
   else
      <normal stuff>
   end
else
   <same as the else clause of the if @reg.save I believe>
end

Validation actually happens on save.

-Adam

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