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refactor: isomorphism for converting sqlbackend-keys

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This commit is contained in:
Gregor Kleen 2020-05-08 15:37:46 +02:00
parent 94f78a07d9
commit 712714c903
1 changed files with 13 additions and 1 deletions
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14
src/Utils/Lens.hs
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@ -28,6 +28,8 @@ import qualified Database.Esqueleto as E (Value(..),InnerJoin(..))
import qualified Data.CaseInsensitive as CI
import Database.Persist.Sql (BackendKey(..))
_PathPiece :: PathPiece v => Prism' Text v
_PathPiece = prism' toPathPiece fromPathPiece
@ -65,7 +67,17 @@ _Maybe = iso (is _Just) (bool Nothing (Just ()))
_CI :: FoldCase s => Iso' (CI s) s
_CI = iso CI.original CI.mk
makeWrapped ''Textarea
instance Wrapped SqlBackendKey where
type Unwrapped SqlBackendKey = Int64
_Wrapped' = iso unSqlBackendKey SqlBackendKey
instance Rewrapped SqlBackendKey t
_SqlKey' :: ToBackendKey SqlBackend record => Iso' (Key record) Int64
_SqlKey' = iso fromSqlKey toSqlKey
_SqlKey :: ToBackendKey SqlBackend record => Iso' (Key record) SqlBackendKey
_SqlKey = _SqlKey' . _Unwrapped
-----------------------------------
-- Lens Definitions for our Types