From: Jan Svitok <jan.svitok@...>
Date: 2007-01-09T23:53:13+09:00
Subject: Re: sortung a structured array on more than one criteria

On 1/9/07, Josselin <josselin@wanadoo.fr> wrote:
> On 2007-01-09 15:29:43 +0100, Josselin <josselin@wanadoo.fr> said:
>
> > I can sort an array like that :
> >
> > results = rs.sort_by{|p| p.km}
> >
> > but I tried to add a scrond sorting criteria like that :
> >
> > results = rs.sort_by{|p| p.km, p.updated_at }
> >
> > and I got obviously an error ...   parse error, unexpected '}',
> > expecting tCOLON2 or '[' or '.'
> >
> > canot find the correct writing..
> >
> > appreciate any help...
> >
> > thanks
> >
> > joss
>
> thanks to both of you... and HNY%2007    (Dry version of Happy New Year
> 2007)   ;-))
>
> I forgot to ask about a DESC sort....    p.km is Ascending and
> p.updated_at should be DESC..
>
> I am not sure that is possible (at least not documented.....)
>
> joss

results = rs.sort_by{|p| p.km, -p.updated_at } # if updated_at is Numeric

or

results = rs.sort { |a,b| [a.km, b.updated_at] <=> [b.km, a.updated_at] }