54 lines
2.2 KiB
Haskell
54 lines
2.2 KiB
Haskell
{-# LANGUAGE NoImplicitPrelude #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE RecordWildCards #-}
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{-# LANGUAGE TemplateHaskell #-}
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{-# LANGUAGE QuasiQuotes #-}
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{-# LANGUAGE MultiParamTypeClasses #-}
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{-# LANGUAGE TypeFamilies #-}
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{-# LANGUAGE FlexibleContexts #-}
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{-# LANGUAGE FlexibleInstances #-}
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module Handler.Utils.Sheet where
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import Import
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import qualified Database.Esqueleto as E
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import qualified Database.Esqueleto.Internal.Sql as E
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fetchSheetAux :: ( BaseBackend backend ~ SqlBackend
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, E.SqlSelect b a
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, Typeable a, MonadHandler m, IsPersistBackend backend
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, PersistQueryRead backend, PersistUniqueRead backend
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)
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=> (E.SqlExpr (Entity Sheet) -> b)
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-> TermId -> SchoolId -> CourseShorthand -> SheetName -> ReaderT backend m a
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fetchSheetAux prj tid ssh csh shn =
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let cachId = encodeUtf8 $ tshow (tid,ssh,csh,shn)
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in cachedBy cachId $ do
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-- Mit Yesod:
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-- cid <- getKeyBy404 $ TermSchoolCourseShort tid ssh csh
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-- getBy404 $ CourseSheet cid shn
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-- Mit Esqueleto:
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sheetList <- E.select . E.from $ \(course `E.InnerJoin` sheet) -> do
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E.on $ course E.^. CourseId E.==. sheet E.^. SheetCourse
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E.where_ $ course E.^. CourseTerm E.==. E.val tid
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E.&&. course E.^. CourseSchool E.==. E.val ssh
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E.&&. course E.^. CourseShorthand E.==. E.val csh
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E.&&. sheet E.^. SheetName E.==. E.val shn
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return $ prj sheet
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case sheetList of
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[sheet] -> return sheet
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_other -> notFound
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fetchSheet :: TermId -> SchoolId -> CourseShorthand -> SheetName -> YesodDB UniWorX (Entity Sheet)
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fetchSheet = fetchSheetAux id
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fetchSheetId :: TermId -> SchoolId -> CourseShorthand -> SheetName -> YesodDB UniWorX (Key Sheet)
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fetchSheetId tid ssh cid shn = E.unValue <$> fetchSheetAux (E.^. SheetId) tid ssh cid shn
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fetchSheetIdCourseId :: TermId -> SchoolId -> CourseShorthand -> SheetName -> YesodDB UniWorX (Key Sheet, Key Course)
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fetchSheetIdCourseId tid ssh cid shn = bimap E.unValue E.unValue <$> fetchSheetAux ((,) <$> (E.^. SheetId) <*> (E.^. SheetCourse)) tid ssh cid shn
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