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More fine grained hoist function

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This commit is contained in:
Tomasz Rybarczyk 2018-12-16 20:02:24 +01:00
parent a04090da0b
commit 07e1c0924b
1 changed files with 8 additions and 4 deletions
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12
src/Database/PostgreSQL/PG.purs
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@ -5,7 +5,8 @@ module Database.PostgreSQL.PG
, PG
, command
, execute
, hoistPG
, hoist
, hoistWith
, query
, onIntegrityError
, scalar
@ -41,11 +42,14 @@ type Database = String
-- | PGError a)`.
type PG a = ExceptT PGError Aff a
hoistPG :: forall m. MonadAff m => PG ~> ExceptT PGError m
hoistPG m = ExceptT $ liftAff $
hoistWith :: forall e m. MonadAff m => (PGError -> e) -> PG ~> ExceptT e m
hoistWith f m = ExceptT $ liftAff $
runExceptT m >>= case _ of
Right a -> pure (Right a)
Left pgError -> pure (Left pgError)
Left pgError -> pure (Left (f pgError))
hoist :: forall m. MonadAff m => PG ~> ExceptT PGError m
hoist = hoistWith identity
-- | Run an action with a connection. The connection is released to the pool
-- | when the action returns.