From 385df82f328c84d0c66c3a227b2e4765d561665a Mon Sep 17 00:00:00 2001
From: Eugen Wissner <belka@caraus.de>
Date: Sun, 5 Mar 2023 08:24:24 +0100
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+# Getting started
+
+We start with a simple GraphQL API that provides us with some famous and less
+famous cites.
+
+```graphql
+"""
+Root Query type.
+"""
+type Query {
+  """
+  Provides a cite.
+  """
+  cite: String!
+}
+```
+
+This is called a GraphQL schema, it defines all queries supported by the API.
+`Query` is the root query type. Every GraphQL API should define a query type.
+
+`Query` has a single field `cite` that returns a `String`. The `!` after the
+type denotes that the returned value cannot be `Null`. GraphQL fields are
+nullable by default.
+
+To be able to work with this schema, we are going to implement it in Haskell.
+
+```haskell
+{-# LANGUAGE OverloadedStrings #-}
+
+import qualified Data.Aeson as Aeson
+import qualified Data.ByteString.Lazy.Char8 as ByteString.Lazy.Char8
+import qualified Data.HashMap.Strict as HashMap
+import Language.GraphQL
+import Language.GraphQL.Type
+import qualified Language.GraphQL.Type.Out as Out
+
+-- GraphQL supports 3 kinds of operations: queries, mutations and subscriptions.
+-- Our first schema supports only queries.
+citeSchema :: Schema IO
+citeSchema = schema queryType Nothing Nothing mempty
+
+-- GraphQL distinguishes between input and output types. Input types are field
+-- argument types and they are defined in Language.GraphQL.Type.In. Output types
+-- are result types, they are defined in Language.GraphQL.Type.Out. Root types
+-- are always object types.
+--
+-- Here we define a type "Query". The second argument is an optional
+-- description, the third one is the list of interfaces implemented by the
+-- object type. The last argument is a field map. Keys are field names, values
+-- are field definitions and resolvers. Resolvers are the functions, where the
+-- actual logic lives, they return values for the respective fields.
+queryType :: Out.ObjectType IO
+queryType = Out.ObjectType "Query" (Just "Root Query type.") []
+    $ HashMap.singleton "cite" citeResolver
+  where
+    -- 'ValueResolver' is a 'Resolver' data constructor, it combines a field
+    -- definition with its resolver function. This function resolves a value for
+    -- a field (as opposed to the 'EventStreamResolver' used by subscriptions).
+    -- Our resolver just returns a constant value.
+    citeResolver = ValueResolver citeField
+        $ pure "Piscis primum a capite foetat"
+
+    -- The first argument is an optional field description. The second one is
+    -- the field type and the third one is for arguments (we have none in this
+    -- example).
+    --
+    -- GraphQL has named and wrapping types. String is a scalar, named type.
+    -- Named types are nullable by default. To make our "cite" field
+    -- non-nullable, we wrap it in the wrapping type, Non-Null.
+    citeField = Out.Field
+        (Just "Provides a cite.") (Out.NonNullScalarType string) HashMap.empty
+
+-- Now we can execute a query. Since our schema defines only one field,
+-- everything we can do is to ask to resolve it and give back the result.
+-- Since subscriptions don't return plain values, the 'graphql' function returns
+-- an 'Either'. 'Left' is for subscriptions, 'Right' is for queries and
+-- mutations.
+main :: IO ()
+main = do
+    Right result <- graphql citeSchema "{ cite }"
+    ByteString.Lazy.Char8.putStrLn $ Aeson.encode result
+```
+
+Executing this query produces the following JSON:
+
+```json
+{
+  "data": {
+    "cite": "Piscis primum a capite foetat"
+  }
+}
+```
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