From mboxrd@z Thu Jan  1 00:00:00 1970
From: jemarch@gnu.org (Jose E. Marchesi)
Subject: Re: Goals for 0.4
Date: Sat, 31 Aug 2013 22:34:50 +0200
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In-Reply-To: <87bo4dspl2.fsf@gnu.org> ("Ludovic
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	\=\?utf-8\?Q\?s\?\= message of "Sat, 31 Aug 2013 20:05:45 +0200")
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To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@gnu.org>
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    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 s=
elect entries of
    a certain age, to display specific fields, etc.  Like:
=20=20=20=20
      generation-number: 1
      date: 2013-05-07
=20=20=20=20
    However, I don=E2=80=99t know exactly how to represent both the generat=
ions and
    the list of packages in each generation in a single recutils stream.
=20=20=20=20
    Jos=C3=A9, how can the relations between =E2=80=9Cgeneration=E2=80=9D r=
ecords 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:

%rec: Generation

Id: 1
Date: Dec. 16 2013

Id: 2
Date: May 7 2013

%rec: Package
%type: Generation rec Generation

Package: guile
Version: 2.0.7
Generation: 1

Package: guile
Version: 2.0.9
Generation: 2

Package: hello
Version: 2.8
Generation 2
=20=20=20=20