public static void Create <TContext>(GraphQLSchema <TContext> schema,
Func <TContext, IQueryable <ICharacter> > herosProviderFunc)
{
schema.AddEnum <EpisodeEnum>();
var characterInterface = schema.AddInterfaceType <ICharacter>();
characterInterface.AddAllFields();
var humanType = schema.AddType <Human>();
humanType.AddAllFields();
humanType.AddInterface(characterInterface);
var droidType = schema.AddType <Droid>();
droidType.AddAllFields();
droidType.AddInterface(characterInterface);
var starshipType = schema.AddType <Starship>();
starshipType.AddAllFields();
schema.AddUnionType("SearchResult",
new[] { typeof(Droid), typeof(Human), typeof(Starship) });
schema.AddField(
"hero",
new { episode = EpisodeEnum.NEWHOPE },
(db, args) => args.episode == EpisodeEnum.EMPIRE
// Luke is the hero of Episode V.
? herosProviderFunc(db).FirstOrDefault(h => h.Id == "1000")
// Artoo is the hero otherwise.
: herosProviderFunc(db).FirstOrDefault(h => h.Id == "2001"));
schema.AddField("human", new { id = "" },
(db, args) => herosProviderFunc(db).OfType <Human>().FirstOrDefault(c => c.Id == args.id));
schema.AddField("droid", new { id = "" },
(db, args) => herosProviderFunc(db).OfType <Droid>().FirstOrDefault(c => c.Id == args.id));
schema.AddField("search", new { text = "" },
(db, args) => args.text == "starship"
? new Starship() as object
: (args.text == "droid"
? new Droid() as object
: new Human() as object))
.WithReturnType("SearchResult");
}