forked from OSS/graphql
285ccb0af9
The main intention with this commit is to show a poor's man way to support type instrospection.
48 lines
1.7 KiB
Haskell
48 lines
1.7 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.Applicative (Alternative, empty)
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import Data.List.NonEmpty (NonEmpty((:|)))
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import Data.GraphQL.Schema (Schema, Resolver, Argument(..), Value(..))
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import qualified Data.GraphQL.Schema as Schema
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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 :: Alternative f => Schema f
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schema = hero :| [human, droid]
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hero :: Alternative f => Resolver f
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hero = Schema.objectA "hero" $ \case
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[] -> character artoo
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[Argument "episode" (ValueInt n)] -> character . getHero $ fromIntegral n
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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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_ -> empty
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human :: Alternative f => Resolver f
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human = Schema.objectA "human" $ \case
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[Argument "id" (ValueString i)] -> character =<< getHuman i
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_ -> empty
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droid :: Alternative f => Resolver f
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droid = Schema.objectA "droid" $ \case
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[Argument "id" (ValueString i)] -> character =<< getDroid i
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_ -> empty
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character :: Alternative f => Character -> [Resolver f]
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character char =
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[ Schema.scalar "id" $ id_ char
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, Schema.scalar "name" $ name char
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, Schema.array "friends" $ character <$> getFriends char
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, Schema.enum "appearsIn" . traverse getEpisode $ appearsIn char
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, Schema.scalar "secretBackstory" $ secretBackstory char
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, Schema.scalar "homePlanet" $ either mempty homePlanet char
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, Schema.scalar "__typename" $ typeName char
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]
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