75 lines
2.5 KiB
Haskell
75 lines
2.5 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 qualified Data.HashMap.Strict as HashMap
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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" Nothing $ HashMap.fromList
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[ ("hero", Field Nothing (ScalarOutputType string) mempty hero)
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, ("human", Field Nothing (ScalarOutputType string) mempty human)
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, ("droid", Field Nothing (ScalarOutputType string) mempty droid)
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]
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hero :: FieldResolver Identity
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hero = NestingResolver $ do
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episode <- argument "episode"
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pure $ 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 :: FieldResolver Identity
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human = NestingResolver $ 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 -> pure Type.Null
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Just e -> pure $ character e
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_ -> ActionT $ throwE "Invalid arguments."
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droid :: FieldResolver Identity
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droid = NestingResolver $ do
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id' <- argument "id"
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case id' of
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Schema.String i -> getDroid i >>= pure . character
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_ -> ActionT $ throwE "Invalid arguments."
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character :: Character -> Type.Wrapping (FieldResolver Identity)
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character char = Schema.object
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[ Schema.wrappedObject "id" $ pure $ Type.S $ id_ char
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, Schema.wrappedObject "name" $ pure $ Type.S $ name_ char
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, Schema.wrappedObject "friends"
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$ pure
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$ Type.List
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$ fmap character
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$ getFriends char
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, Schema.wrappedObject "appearsIn" $ pure
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$ Type.List $ Type.E <$> catMaybes (getEpisode <$> appearsIn char)
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, Schema.wrappedObject "secretBackstory" $ Type.S <$> secretBackstory char
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, Schema.wrappedObject "homePlanet" $ pure $ Type.S $ either mempty homePlanet char
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, Schema.wrappedObject "__typename" $ pure $ Type.S $ typeName char
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]
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