Rails - Jan 2005 - collection_select

I''m trying to use collection_select, but it''s not working as I
expect. The
list populates correctly but the current value is not selected.

@question contains a topic (via topic_id), and @topics is the list of all 
topics. Here''s my attempt to create a drop-down list of the topics.

   form("question") do | form |
     form << content_tag("b", "Topic")
     form << collection_select("topic", "topic_id",
@topics, "id", "name")
     form << tag("br") + tag("br")
   end

The select list displays all the proper topic names and id numbers, but the 
current value (@question.topic_id) is not selected.

Hmm...does form("question") use the instance variable @question? If
not, then
I can see how topic_id would not be populated.

Thanks for any help or suggestions.

Jim
-- 
Jim Menard, jimm-Xhj3G7Rj6JI@public.gmane.org, http://www.io.com/~jimm

Jim,

Form helpers like text_field, collection_select etc  currently work 
right only with instance variables. In your case topic is a local 
variable and therefore the current value is not passed correctly. I 
haven''t tested it but I think it might solve your problem if
you''d add
the following in your code:
>
>   form("question") do | form |
	@topic = topic
>     form << content_tag("b", "Topic")
>     form << collection_select("topic",
"topic_id", @topics, "id",
> "name")
>     form << tag("br") + tag("br")
>   end
>
> The select list displays all the proper topic names and id numbers, 
> but the current value (@question.topic_id) is not selected.
>
> Hmm...does form("question") use the instance variable @question?
If
> not, then I can see how topic_id would not be populated.
>
> Thanks for any help or suggestions.
>
> Jim
> -- 
> Jim Menard, jimm-Xhj3G7Rj6JI@public.gmane.org, http://www.io.com/~jimm
>
> _______________________________________________
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>
--
Jarkko Laine
http://jlaine.net
http://odesign.fi


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Jarkko,
> Form helpers like text_field, collection_select etc  currently work 
> right only with instance variables. In your case topic is a local 
> variable and therefore the current value is not passed correctly.  I
> haven''t tested it but I think it might solve your problem if
you''d add
> the following in your code:
I''ll try your solution, but I''m confused because topic *is* an
instance
variable of @question. Oh, I see: topic needs to be an instance variable of 
the controller, not of the @question object.
> 
>>  form("question") do | form |
> 
> 	@topic = topic
I used

	@topic = @question.topic

and that worked. Thank you.
> 
>>    form << content_tag("b", "Topic")
>>    form << collection_select("topic",
"topic_id", @topics, "id",
>>"name")
>>    form << tag("br") + tag("br")
>>  end
>>
Jim
-- 
Jim Menard, jimm-Xhj3G7Rj6JI@public.gmane.org, http://www.io.com/~jimm