Ruby on Rails

On 4 September 2010 01:27, Pito Salas <lists@ruby-forum.com> wrote:
> 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?

I think you are missing a trick. Once you have my_line_item, to get
the item's order just do
my_line_item.order
There is no need to use find at all.

Colin

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