Well, thank you very much Daniel :-) your information is quite useful
I checked my code, yes, it is like <select name="item[brand]" ...>
I forgot to mentioned that, I have tried to use "<%=
f.collection_select(:brand_id, Brand.find(:all), :id, :name,
{:prompt => "please select one brand"}) %> "
But, I have got another error "undefined method `brand_id' for #<Item:
0x6ce3258>"
I assumed maybe there is another place I should take care of? in the
items controller?
I was totally confused, sorry.
On Oct 13, 4:19 pm, Daniel <[EMAIL PROTECTED]> wrote:
> I sometimes find these helper methods quite confusing. The key is
> what parameters they are sending back to your controller when you hit
> the create button.
> Check your logs if you're unsure.
> The above line is probably sending
> params[:item][:brand] => <brand-id>
> where <brand-id> is the id number for an existing brand.
> Another way to check is to look at the generated select tag; it will
> probably be <select name="item[brand]" ...> (note how 'params' builds
> its hash structure off the 'name' attribute).
>
> You might want to change it to:
> <%= f.collection_select(:brand_id, Brand.find(:all), :id, :name,
> {:prompt => "please select one brand"}) %>
>
> It depends on what your 'create' controller is doing; I assume you're
> just instantiating a new item object and passing over the field values
> from 'params'. So if your object sees params[:item][:brand_id] you
> might get what you want - the <brand-id> will be inserted into the
> items.brand_id field. If it sees 'brand' as per the original, then
> I'm guessing it's trying to build the assocation via the Item#brand
> association method which probably expects a Brand object and not its
> id (in string form).
>
> I always have to go back and check the docs. So what I've said above
> might not be totally right. Get to know how 'params' is generated.
> Writing stuff test-first on your functional tests will start you
> thinking like this too.
>
> Daniel
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