Data.Morpheus.Types.GQLScalar

Documentation

class GQLScalar a where

GraphQL Scalar

parseValue and serialize should be provided for every instances manually

Minimal complete definition

parseValue, serialize

Methods

parseValue :: ScalarValue -> Either Text a

value parsing and validating

for exhaustive pattern matching should be handled all scalar types : ScalarValue, ScalarValue, String, Boolean

invalid values can be reported with Left constructor :

  parseValue String _ = Left "" -- without error message
  -- or
  parseValue String _ = Left "Error Message"

serialize :: a -> ScalarValue

serialization of haskell type into scalar value

scalarValidator :: f a -> ScalarDefinition

Instances

GQLScalar Bool

Defined in Data.Morpheus.Types.GQLScalar

Methods

parseValue :: ScalarValue -> Either Text Bool

serialize :: Bool -> ScalarValue

scalarValidator :: f Bool -> ScalarDefinition

GQLScalar Float

Defined in Data.Morpheus.Types.GQLScalar

Methods

parseValue :: ScalarValue -> Either Text Float

serialize :: Float -> ScalarValue

scalarValidator :: f Float -> ScalarDefinition

GQLScalar Int

Defined in Data.Morpheus.Types.GQLScalar

Methods

parseValue :: ScalarValue -> Either Text Int

serialize :: Int -> ScalarValue

scalarValidator :: f Int -> ScalarDefinition

GQLScalar Text

Defined in Data.Morpheus.Types.GQLScalar

Methods

parseValue :: ScalarValue -> Either Text Text

serialize :: Text -> ScalarValue

scalarValidator :: f Text -> ScalarDefinition

GQLScalar ID

Defined in Data.Morpheus.Types.ID

Methods

parseValue :: ScalarValue -> Either Text ID

serialize :: ID -> ScalarValue

scalarValidator :: f ID -> ScalarDefinition

toScalar :: ValidValue -> Either Text ScalarValue

scalarToJSON :: GQLScalar a => a -> Value

scalarFromJSON :: (Monad m, MonadFail m) => GQLScalar a => Value -> m a