[Rails] Using ActiveRecord Find with associations

Here's an example:

class LineItem < ActiveRecord::Base
belongs_to :order
end

class Order < ActiveRecord::Base
has_many :line_items
end

my_line_item = LineItem.find(:zipcode => "12345")

Order.find_by_line_item(my_line_item) # doesn't work

Order.find_by_line_item_id (my_line_item) # does work

I was surprised by this, because it seems to force me to make reference
to the id field of the line item, rather than referring to the LineItem
as a class or type in the Order.findxxx statement.

Am I misunderstanding something or missing a trick?

Thanks!!

-- Pito
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