On Wed, Apr 1, 2009 at 9:16 AM, Tom Harvey
<[email protected]> wrote:
>
> I was doing this:
>
> @line_items = LineItems.find_all_by_invoice_id(params[:id])
> @payments = Payments.find_all_by_invoice_id(params[:id])
>
> �...@total = @line_items.sum{ |item| item.cost }
> �...@payment_total = @payments.sum{ |payment| payment.value }
You can do
@payment_total = @payments.sum{ |payment| payment.value } if @payments
or
@payment_total = @payments.sum{ |payment| payment.value } rescue 0
or
@payment_total = @payments ? @payments.sum{ |payment| payment.value } : 0
> �...@balance = @total - @payment_total
>
>
> But when no payments had been made it was coming up with an error when
> trying to sum nil, so I did this:
>
> begin
> �...@payment_total = @payments.sum{ |payment| payment.value }
> rescue
> �...@payment_total = 0
> end
>
> So, when the sum failed it returned @payment_total as zero. Now, SURELY,
> there's a better way to do this? I'm sure it's obvious when you know
> how. Please, enlighten me.
--
Greg Donald
http://destiney.com/
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