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Re: Pre-Qualifying Perl Questions

by pemungkah (Priest)
on Oct 05, 2010 at 19:21 UTC ( #863663=note: print w/replies, xml ) Need Help??

in reply to Pre-Qualifying Perl Questions

To avoid "circulating list of answers" syndrome, I like to suggest asking them to design and write a vaguely-described small module to see what they do. Do they start writing code right away, or do they ask more qustions to pin things down better? Do they say something like "I'd use Module::Starter to get my skeleton files, then ..."

Do they write tests, or at least mention that tests would be a good idea? Do they say "we should check CPAN first"?

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[erix]: then you might as well send that patch to the DBIC guys :)
[Corion]: erix: Yeah, I just found that it has no documentation at all on how to circumvent/ eliminate "1+n SELECTs" by building a local hash... I guess I have to make ->has_many do the hash lookup instead of doing the SQL query. But as the problem ...
[Corion]: ... has only manifested itself so far through the puzzled questions of other bystanders, I won't go deeper at this time. But the DBIx::Class documentation could well do with a document on how to make "it" (that is, ORMs in general) faster ;)
[Corion]: I find that DBIx::Class, like most ORMs makes things easy until they become performance critical and then makes it horribly hard to change things because the design is highly inflexible if you don't already know about the problems of 1+n :-/
[choroba]: that's why I don't like similar libraries. They pretend you don't have to learn SQL, but in the end, you have to learn how SQL plus to overcome their own limitations
[Corion]: "Just write the proper SQL beforehand" is of course the appropriate solution, but if you did that, you wouldn't/couldn't use DBIx::Class either. At least not in an obvious (to me) way.
choroba scratches a "how"
[Corion]: choroba: Exactly... But maybe that's just because I'm old and grumpy ;)
[Corion]: But maybe that could also be a nice talk, how to restructure your DBIx::Class-based app to remove 1+n-style query patterns

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