From: Paulo Carvalho <pjcarvalho@...>
Date: 2007-10-18T00:12:07+09:00
Subject: Re: sort_by

Hello

Thanks for your quick answer.

However i am having a problem.

I used the syntax that you give to me like this :

To order (ASC way):
values_ordered = @demandes.sort_by{|value| value.eluxid}
(This one works fine)

To order (DESC way)
values_ordered = @demandes.sort_by{|value| -value.eluxid}
This one send to me a syntax error (I think he dont like the '-'):
undefined method `-@' for ["3CC11A"]:Array

(note: "3CC11A" is the column value of my first row)

Any idea of where is the problem?

Thanks again




Farrel Lifson wrote:
> On 17/10/2007, Paulo Carvalho <pjcarvalho@gmail.com> wrote:
>> I have a list of rows which I want to order by a column.
>> I make it with
>> @values_ordered = @values.sort_by(&:id_column)
>>
>> What if I want to inverse the order (like order by x desc in SQL)
>>
>> How could I do that using sort_by? is that possible?
> 
> values_orderd = @values.sort_by{|value| -value.id_column}

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