Rails - Apr 2006 - Forms Containing Collections problem

Can anyone tell me why I''m getting the error "The error occured
while
evaluating nil.id_before_type_cast" for the following view code

<% 	for entry in participant_portfolio.portfolio_entries -%>
	<%= select "entry[]" , :id, @buyer_profiles,
						:selected => entry.buyer_profile_id %>
<% end -%>


This seems to only happen when I use "entry[]" instead of just  
"entry".  I need the id of the entry being written in the form and  
thus would prefer to use the "entry[]" method.

Page 344 of AWDWR makes it look like it should work, but for some  
reason I can''t get it to.

Any help is appreciated!

Michael Jurewitz
sinjin5@mac.com



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Michael Jurewitz wrote:
> Can anyone tell me why I''m getting the error "The error
occured while
> evaluating nil.id_before_type_cast" for the following view code
> 
> <%     for entry in participant_portfolio.portfolio_entries -%>
>     <%= select "entry[]" , :id, @buyer_profiles,
>                         :selected => entry.buyer_profile_id %>
> <% end -%>
AR form helpers operate on instance variables, so you need to use
@entry rather than just entry in both your for statement and
:selected option.

-- 
We develop, watch us RoR, in numbers too big to ignore.

Mark Reginald James wrote:
> Michael Jurewitz wrote:
>> <%     for entry in participant_portfolio.portfolio_entries -%>
>>     <%= select "entry[]" , :id, @buyer_profiles,
>>                         :selected => entry.buyer_profile_id %>
>> <% end -%>
> 
> AR form helpers operate on instance variables, so you need to use
> @entry rather than just entry in both your for statement and
> :selected option.
I have hacked this in the past by having the first line of the for block 
be

@current_entry = entry

so that for block creates a local var ''entry'' and I assign it
to a
member var, just so I can use the helpers.

I assume there''s a much cleaner ay of doing this, but that works in a 
push.

A.

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