From: Christopher Baines <mail@cbaines.net>
To: Luciana Lima Brito <lubrito@posteo.net>
Cc: guix-devel@gnu.org
Subject: Re: Outreachy - Guix Data Service: questions about improving the data for derivation comparisons.
Date: Thu, 22 Apr 2021 22:15:34 +0100 [thread overview]
Message-ID: <87zgxqggw9.fsf@cbaines.net> (raw)
In-Reply-To: <20210422180208.28473e41@lubrito>
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Luciana Lima Brito <lubrito@posteo.net> writes:
> On Thu, 22 Apr 2021 21:08:08 +0100
> Christopher Baines <mail@cbaines.net> wrote:
>
>> I'm not quite sure what you mean by empty fields in the JSON here?
>
> I mean now it appears like this in the json
>
> hash-alg: {}
>
> Before, it was entirely omitted.
Right, OK. I'd call that an empty object.
>> It sounds like you're roughly on the right track, do share what
>> changes you're making and then I can have a look.
>
> This is the part I've changed on comparison.scm in the function
> derivation-outputs-differences-data:
>
> (map (match-lambda
> ((output-name path hash-algorithm hash recursive
> derivation_ids)
> (let ((parsed-derivation-ids
> (map string->number
> (parse-postgresql-array-string derivation_ids))))
> (list output-name
> path
> (if (string? hash-algorithm)
> hash-algorithm
> '())
> (if (string? hash)
> hash
> '())
> (string=? recursive "t")
> (append (if (memq base-derivation-id
> parsed-derivation-ids)
> '(base)
> '())
> (if (memq target-derivation-id
> parsed-derivation-ids)
> '(target)
> '()))))))
> (exec-query conn query))
>
> Basically, I moved the hash-algorithm, hash, and recursive tests from
> controller.scm here. I spent more time familiarizing with this part of
> the code and the dataset. I don't have anything ready for the idea I
> told you in the last email because I'm not so sure if that is the way
> to go, but I can make some experiments in this regard.
The bit for the recursive field looks fine.
I'd suggest avoiding '() as the value for hash and hash-algorithm when
they're NULL in the database. One option here that I've used in some
places is to return a alist rather than a list. This can simplify JSON
output since it's often a alist that's desired, and can avoid breaking
matches when they're matching on the list.
Does that make sense?
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next prev parent reply other threads:[~2021-04-22 21:16 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-21 18:29 Outreachy - Guix Data Service: questions about improving the data for derivation comparisons Luciana Lima Brito
2021-04-22 7:53 ` Christopher Baines
2021-04-22 20:00 ` Luciana Lima Brito
2021-04-22 20:08 ` Christopher Baines
2021-04-22 21:02 ` Luciana Lima Brito
2021-04-22 21:15 ` Christopher Baines [this message]
2021-04-23 21:15 ` Luciana Lima Brito
2021-04-23 21:48 ` Christopher Baines
2021-04-25 20:15 ` Luciana Lima Brito
2021-04-26 8:15 ` Christopher Baines
2021-04-26 19:11 ` Luciana Lima Brito
2021-04-26 21:21 ` Christopher Baines
2021-04-27 13:10 ` Luciana Lima Brito
2021-04-27 18:23 ` Christopher Baines
2021-04-27 18:33 ` Luciana Lima Brito
2021-04-27 18:42 ` Christopher Baines
2021-04-27 19:53 ` Luciana Lima Brito
2021-04-27 20:29 ` Christopher Baines
2021-04-27 22:35 ` Luciana Lima Brito
2021-04-28 7:56 ` Christopher Baines
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