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 }
@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.
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