22 lines
635 B
Haskell
22 lines
635 B
Haskell
{-# Language TypeApplications #-}
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{-# Language DataKinds #-}
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module Database.Book (usersBooks, Book(..)) where
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import ClassyPrelude
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import Database.Schema
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import Database
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import Database.Selda
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usersBooks :: (MonadMask m, MonadIO m) => Username -> SeldaT m [Book]
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usersBooks username = fromRels <$> query q
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where
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q = do
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userId :*: _ :*: username' :*: _ <- select (gen users)
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userId' :*: bookHash' <- select (gen userBooks)
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book@(bookHash :*: _) <- select (gen books)
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restrict (bookHash .== bookHash')
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restrict (username' .== literal username)
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restrict (userId .== userId')
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return book
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