forked from OSS/graphql
70 lines
2.3 KiB
Haskell
70 lines
2.3 KiB
Haskell
{-# LANGUAGE OverloadedStrings #-}
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module Test.StarWars.Schema
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( character
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, droid
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, hero
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, human
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, schema
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) where
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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.Functor.Identity (Identity)
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import Data.List.NonEmpty (NonEmpty(..))
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import Data.Maybe (catMaybes)
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import qualified Language.GraphQL.Schema as Schema
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import Language.GraphQL.Trans
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import Language.GraphQL.Type.Definition
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import qualified Language.GraphQL.Type as Type
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import Language.GraphQL.Type.Schema
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import Test.StarWars.Data
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-- See https://github.com/graphql/graphql-js/blob/master/src/__tests__/starWarsSchema.js
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schema :: Schema Identity
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schema = Schema { query = queryType, mutation = Nothing }
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where
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queryType = ObjectType "Query"
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$ Schema.resolversToMap
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$ hero :| [human, droid]
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hero :: Schema.Resolver Identity
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hero = Schema.object "hero" $ do
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episode <- argument "episode"
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character $ case episode of
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Schema.Enum "NEWHOPE" -> getHero 4
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Schema.Enum "EMPIRE" -> getHero 5
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Schema.Enum "JEDI" -> getHero 6
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_ -> artoo
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human :: Schema.Resolver Identity
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human = Schema.wrappedObject "human" $ do
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id' <- argument "id"
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case id' of
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Schema.String 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 Type.Null
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Just e -> Type.Named <$> character e
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_ -> ActionT $ throwE "Invalid arguments."
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droid :: Schema.Resolver Identity
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droid = Schema.object "droid" $ do
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id' <- argument "id"
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case id' of
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Schema.String i -> character =<< getDroid i
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_ -> ActionT $ throwE "Invalid arguments."
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character :: Character -> ActionT Identity [Schema.Resolver Identity]
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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.wrappedObject "friends"
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$ traverse character $ Type.List $ Type.Named <$> getFriends char
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, Schema.wrappedScalar "appearsIn" $ return . Type.List
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$ catMaybes (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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