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Add instance for Lift type class from Template Haskell #31

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Merged
tfausak merged 2 commits into from
Sep 12, 2025
Merged

Add instance for Lift type class from Template Haskell #31

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b5be124
Add instance for Lift type class from Template Haskell
tfausak Sep 12, 2025
836e92f
Avoid adding dependency to test suite
tfausak Sep 12, 2025
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1 change: 1 addition & 0 deletions postgresql-simple-interval.cabal
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Expand Up @@ -64,6 +64,7 @@ library
build-depends:
persistent ^>=2.17,
scientific ^>=0.3.8,
template-haskell >=2.15 && <2.24,
text >=1.2.4 && <1.3 || >=2.0 && <2.2,

-- cabal-gild: discover source/library
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4 changes: 3 additions & 1 deletion source/library/Database/PostgreSQL/Simple/Interval/Unstable.hs
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@@ -1,4 +1,5 @@
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveLift #-}
{-# LANGUAGE NumDecimals #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
Expand Down Expand Up @@ -27,6 +28,7 @@ import qualified Database.PostgreSQL.Simple.FromField as Postgres
import qualified Database.PostgreSQL.Simple.ToField as Postgres
import qualified Database.PostgreSQL.Simple.TypeInfo.Static as Postgres
import qualified GHC.TypeLits as TypeLits
import qualified Language.Haskell.TH.Syntax as TH

-- | This type represents a PostgreSQL interval. Intervals can have month, day,
-- and microsecond components. Each component is bounded, so they are not
Expand All @@ -53,7 +55,7 @@ data Interval = MkInterval
days :: !Int.Int32,
microseconds :: !Int.Int64
}
deriving (Eq, Show)
deriving (Eq, TH.Lift, Show)

-- | Uses 'parse'. Ensures that the OID is 'Postgres.intervalOid'.
instance Postgres.FromField Interval where
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