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From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: Goals for 0.4
Date: Sat, 31 Aug 2013 23:07:24 +0200
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In-Reply-To: <87a9jxeh05.fsf@gnu.org> (Jose E. Marchesi's message of "Sat, 31
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To: "Jose E. Marchesi" <jemarch@gnu.org>
Cc: guix-devel@gnu.org

jemarch@gnu.org (Jose E. Marchesi) skribis:

>     I just realized that we can do even better: have --list-generations
>     output recutils-formatted data (using =E2=80=98object->fields=E2=80=
=99).  Then, if we do
>     it right, the output can just be piped to =E2=80=98recsel=E2=80=99 to=
 select entries of
>     a certain age, to display specific fields, etc.  Like:
>=20=20=20=20=20
>       generation-number: 1
>       date: 2013-05-07
>=20=20=20=20=20
>     However, I don=E2=80=99t know exactly how to represent both the gener=
ations and
>     the list of packages in each generation in a single recutils stream.
>=20=20=20=20=20
>     Jos=C3=A9, how can the relations between =E2=80=9Cgeneration=E2=80=9D=
 records and =E2=80=9Cpackage=E2=80=9D
>     records be expressed?
>
> You can have two record sets: one for generations, one for packages.  A
> foreign key can relate them.  Something like this:

Perfect, thanks!

Ludo=E2=80=99.