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2021-05-16 17:34:55 <charukiewicz> The reason for this is because I'm okay with keeping my model types as comprised of mostly primitive types and then convert them to domain types through simple conversion functions, as necessary
2021-05-16 17:34:56 <maerwald> so when ppl talk about typesafety in SQL, what they actually mean most of the time is mapping their backend types into SQL types
2021-05-16 17:35:35 × cfricke quits (~cfricke@unaffiliated/cfricke) (Ping timeout: 260 seconds)
2021-05-16 17:35:40 <Uniaika> or they mean Squeal, at which point I can only comment their soul to whatever divinity they believe in
2021-05-16 17:35:45 <charukiewicz> Again, I find this not particularly error prone if you're using Persistent Entity Syntax
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2021-05-16 17:36:06 <Uniaika> electricityZZZZ: I don't think there is such a propertu
2021-05-16 17:36:10 <Uniaika> *property
2021-05-16 17:36:11 <maerwald> I'd much rather write that mapping manually instead of having a bunch of obscure TH and a looot of instances I easily lose overview over
2021-05-16 17:38:21 <blankhart> nm looks like the usage is some kind of pure form of dispatching on types https://github.com/gelisam/klister/blob/71c71e6ab768e7e6b43e9402bc127423cd6e562b/examples/which-problem.kl#L25
2021-05-16 17:38:53 <charukiewicz> If you prefer to write 60 lines of boilerplate per table instead of using some TH, that's your decision, but after my experience, I much prefer to use the entity syntax to define my types
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2021-05-16 17:43:10 <charukiewicz> and more broadly, marshalling data in and out of Haskell is going to be the most error prone part of your code. I try to keep that hand written code at a minimum, which is why I'm a fan of both persistent entity syntax on the database side and using deriveJSON in Aeson to define my encoders/decoders on the http side
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2021-05-16 17:48:12 <charukiewicz> The Yesod book gives a good side-by-side as to what the TH generates, and just seeing what's necessary for a 3 column table, I wouldn't recommend anyone write that by hand for their whole database. Here's the relevant bit from the book: https://www.yesodweb.com/book/persistent#persistent_code_generation
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2021-05-16 17:58:51 <a6a45081-2b83> any idea how to convert HashMap to Persistent Entities?
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2021-05-16 18:16:23 <charukiewicz> a6a45081-2b83: do you want each KV pair in your HashMap to be its own record in your DB?
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2021-05-16 18:17:41 <a6a45081-2b83> for e.g. Person {name :: String, age :: Int} then I want f (fromList [("name", "Foo"), ("age", 3)]) == Person "Foo" 3
2021-05-16 18:17:59 <a6a45081-2b83> obviously this is easy to define for few record fields but what if I have lot of them ...
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2021-05-16 18:18:53 <a6a45081-2b83> there are some JSON utilities though: https://hackage.haskell.org/package/persistent-2.13.0.1/docs/Database-Persist.html#g:4
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2021-05-16 18:19:05 <a6a45081-2b83> I am not sure how to use them
2021-05-16 18:19:09 <geekosaur> that looks like a type error to me
2021-05-16 18:19:48 <a6a45081-2b83> sorry, the actual link is https://hackage.haskell.org/package/persistent-2.13.0.1/docs/Database-Persist-Class.html#g:9
2021-05-16 18:20:25 <a6a45081-2b83> this one in particular: keyValueEntityFromJSON :: (PersistEntity record, FromJSON record) => Value -> Parser (Entity record)
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2021-05-16 18:42:48 <charukiewicz> a6a45081-2b83: that function requires your JSON to objects to have "key" and "value" keys
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2021-05-16 18:44:52 <charukiewicz> I think you're better off writing your own toPersonEntity :: HashMap k v -> Maybe Person
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