forked from OSS/graphql
56 lines
2.1 KiB
Haskell
56 lines
2.1 KiB
Haskell
{-# LANGUAGE LambdaCase #-}
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{-# LANGUAGE OverloadedStrings #-}
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module Test.StarWars.Schema where
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import Control.Monad (MonadPlus(..))
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import Control.Monad.Trans.Except (throwE)
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import Control.Monad.Trans.Class (lift)
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import Data.List.NonEmpty (NonEmpty((:|)))
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import Data.GraphQL.Schema ( Schema
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, Resolver
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, Argument(..)
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, Value(..)
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)
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import qualified Data.GraphQL.Schema as Schema
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import Language.GraphQL.Trans
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import Test.StarWars.Data
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-- * Schema
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-- See https://github.com/graphql/graphql-js/blob/master/src/__tests__/starWarsSchema.js
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schema :: MonadPlus m => Schema m
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schema = hero :| [human, droid]
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hero :: MonadPlus m => Resolver m
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hero = Schema.objectA "hero" $ \case
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[] -> character artoo
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[Argument "episode" (ValueEnum "NEWHOPE")] -> character $ getHero 4
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[Argument "episode" (ValueEnum "EMPIRE" )] -> character $ getHero 5
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[Argument "episode" (ValueEnum "JEDI" )] -> character $ getHero 6
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_ -> ActionT $ throwE "Invalid arguments."
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human :: MonadPlus m => Resolver m
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human = Schema.nullableObject "human" $ \case
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[Argument "id" (ValueString i)] -> do
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humanCharacter <- lift $ return $ getHuman i >>= Just
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case humanCharacter of
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Nothing -> return Nothing
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Just e -> Just <$> character e
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_ -> ActionT $ throwE "Invalid arguments."
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droid :: MonadPlus m => Resolver m
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droid = Schema.objectA "droid" $ \case
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[Argument "id" (ValueString i)] -> character =<< lift (getDroid i)
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_ -> ActionT $ throwE "Invalid arguments."
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character :: MonadPlus m => Character -> ActionT m [Resolver m]
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character char = return
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[ Schema.scalar "id" $ return $ id_ char
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, Schema.scalar "name" $ return $ name char
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, Schema.array "friends" $ traverse character $ getFriends char
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, Schema.enum "appearsIn" $ return $ foldMap getEpisode $ appearsIn char
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, Schema.scalar "secretBackstory" $ secretBackstory char
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, Schema.scalar "homePlanet" $ return $ either mempty homePlanet char
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, Schema.scalar "__typename" $ return $ typeName char
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]
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