Rails - Aug 2009 - NoMethodError with unexpected nil object in ERB

I have created original method and trying to pass newly instantiated
object to ERB file, but encountering NoMethodError in ERB file with the
following error message.

-------------------------------------------------------
NoMethodError in Products#lookup

Showing app/views/products/lookup.html.erb where line #3 raised:

You have a nil object when you didn''t expect it!
You might have expected an instance of ActiveRecord::Base.
The error occurred while evaluating nil.[]
Extracted source (around line #3):

1: <h1>Add product</h1>
2:
3: <% form_for(@product) do |f| %>
4:   <%= f.error_messages %>
5:
6:   <p>
-------------------------------------------------------

Source Code
products_controller.rb
-------------------------------------------------------
  # GET /products/lookup
  # GET /products/lookup.xml
  def lookup
    result = Amazon::Ecs.item_lookup(params[:id]).first_item
    @product = AmazonProduct.new(
      result.get(''asin''),
      result.get(''itemattributes/manufacturer''),
      result.get(''title''),
      "",
      result.get(''detailpageurl''),
      ""
    )
  end
end
-------------------------------------------------------

lookup.html.erb
-------------------------------------------------------
<h1>Add product</h1>

<% form_for(@product) do |f| %>
  <%= f.error_messages %>

  <p>
    <%= f.label :id %>: <%= @product.amazon_asin %><br />
-------------------------------------------------------

When viewing @product variable by running this flow in Aptana debug mode
and stop it at erb source code, @product seems to have information and
not nil (See attached). I was trying to copy standard rails
controller/erb approach for other method, but it''s not working well for
this. May I have any advice? Thank you.

Attachments:
http://www.ruby-forum.com/attachment/3980/Picture_3.png

-- 
Posted via http://www.ruby-forum.com/.

On Aug 27, 5:32 pm, Ryoichiro Kamiya <rails-mailing-l...@andreas-
s.net> wrote:
>
> When viewing @product variable by running this flow in Aptana debug mode
> and stop it at erb source code, @product seems to have information and
> not nil (See attached). I was trying to copy standard rails
> controller/erb approach for other method, but it''s not working
well for
> this. May I have any advice? Thank you.
>
is an instance of AmazonProduct look enough like an ActiveRecord model
that you can pass it to form_for like that ?

Fred
> Attachments:http://www.ruby-forum.com/attachment/3980/Picture_3.png
>
> --
> Posted viahttp://www.ruby-forum.com/.

Frederick Cheung wrote:
> On Aug 27, 5:32�pm, Ryoichiro Kamiya <rails-mailing-l...@andreas-
> s.net> wrote:
>>
>> When viewing @product variable by running this flow in Aptana debug
mode
>> and stop it at erb source code, @product seems to have information and
>> not nil (See attached). I was trying to copy standard rails
>> controller/erb approach for other method, but it''s not working
well for
>> this. May I have any advice? Thank you.
>>
> is an instance of AmazonProduct look enough like an ActiveRecord model
> that you can pass it to form_for like that ?
> 
> Fred
The AmazonProduct is inheriting the Product class which has been 
scaffolded by rails. Is the class which inheriting the ActiveRecord 
model class also assumed ActiveRecord model class?

Class AmazonProduct < Product
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