[Rails] Re: Use find with a variable

So, I do find the "part", using a = Part.find_by_id(the_id)

If I do <%= debug a %> I get...
----------------------
attributes:
name: Western Digital - Caviar GP 500GB Internal Hard Drive
created_at: 2011-08-23 18:54:12.214873
cost: 49.99
updated_at: 2011-08-23 18:54:12.214873
id: 2
[...]
-------------------

but if I do
a.cost

I get error...
undefined method `cost' for nil:NilClass

How is it going to be a nil class? If I do a.class I get "Part", then
it's NOT a nil class.

It's weird, if I do exactly the same thing in the console a.cost does
work.

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