On 2007-01-09 15:53:13 +0100, "Jan Svitok" <jan.svitok / gmail.com> said:

> 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] }

thanks ,  'updated_at'  is  a string  ( "2007-01-04 13:48:30")
I try to understand the writing...  why the first parameter will be 
Ascending and the second Descending  ...

how would you write it, if both parameters  shoudl be Descending ?

Joss