On 14 aoû¹, 20:33, Michael Libby <michael.c.li... / gmail.com> wrote:
> On Thu, Aug 14, 2008 at 12:27 PM,Erwin<yves_duf... / mac.com> wrote:
> > On 14 aoû¹, 19:24,Erwin<yves_duf... / mac.com> wrote:
> >> I know there is DRY way tow rite that, but I don't remember how
>
> >> residence_rentals_ids = []
> >> residences = user.franchise.residences
> >> or residence in residences
> >> esidence_rentals_ids = residence.rentals.map {|rental|
> >> rental[:id] }.compact
> >> end
>
> >> I tried unsuccessfully :
>
> >> residence_rentals_ids = user.franchise.residences.each { |residence|
> >> residence.rentals.map { |rental| rental[:id}.compact }
>
> >> thanks for your lights
>
> >>erwin
>
> > got it 
> > residence_rentals_ids = []
> > user.franchise.residences.each { |residence| residence.rentals.map { |
> > rental| residence_rentals_ids << rental[:id] }.compact }
>
> > but is there a way to avoid the residence_rentals_ids = [] ine,
> > including the array initialization into a block ?
>
> Generally you don't want a map without assigning the result to something.
>
> Does this do what you want?
>
> residence_rental_ids = user.franchise.residences.map{|residence|
> residence.rentals.map{|rental| rental[:id] } }.flatten
>
> -Michael

that's it... thanks a lot.. I was missing the .flatten functionality