src/Rel8/Type/JSONBEncoded.hs · rel8

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rel8/src/Rel8/Type/JSONBEncoded.hs

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1module Rel8.Type.JSONBEncoded ( JSONBEncoded(..) ) where

3-- aeson

4import Data.Aeson ( FromJSON, ToJSON, parseJSON, toJSON )

5import Data.Aeson.Types ( parseEither )

7-- base

8import Data.Bifunctor ( first )

9import Prelude

11-- hasql

12import qualified Hasql.Decoders as Hasql

14-- rel8

15import Rel8.Type ( DBType(..) )

16import Rel8.Type.Information ( TypeInformation(..) )

18-- text

19import Data.Text ( pack )

22-- | Like 'Rel8.JSONEncoded', but works for @jsonb@ columns.

23newtype JSONBEncoded a = JSONBEncoded { fromJSONBEncoded :: a }

26instance (FromJSON a, ToJSON a) => DBType (JSONBEncoded a) where

27 typeInformation = TypeInformation

28 { encode = encode typeInformation . toJSON . fromJSONBEncoded

29 , decode = Hasql.refine (first pack . fmap JSONBEncoded . parseEither parseJSON) Hasql.jsonb

30 , typeName = "jsonb"

31 }