Yesod/Persistent one-to-one query

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猫巷女王i
猫巷女王i 2021-01-21 02:02

Say, in Yesod/Persistent, I have models setup like so:

User
    ident Text
    password Text Maybe
    UniqueUser ident
Question
    title Text
    asker UserId          


        
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  •  清歌不尽
    2021-01-21 02:58

    I haven't type-checked this yet, but I would stick the whole thing inside of runDB:

    runDB $ selectList [QuestionTitle !=. ""] [LimitTo 10] >>= mapM (\qe@(Entity _ q) -> do
        asker <- get $ questionAsker q
        return (qe, asker))
    

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