public static SchemaProvider <DemoContext> MakeSchema()
{
// build our schema directly from the DB Context
var demoSchema = SchemaBuilder.FromObject <DemoContext>();
demoSchema.AddCustomScalarType(typeof(DateTime), "Date");
demoSchema.AddCustomScalarType(typeof(DateTime?), "Date");
// we can extend the schema
// Add custom root fields
demoSchema.ReplaceField("actors", new
{
filter = ArgumentHelper.EntityQuery <Person>()
}, (db, param) => db.People.Where(p => p.ActorIn.Any()).WhereWhen(param.filter, param.filter.HasValue), "List of actors");
demoSchema.AddField("writers", db => db.People.Where(p => p.WriterOf.Any()), "List of writers");
demoSchema.AddField("directors", db => db.People.Where(p => p.DirectorOf.Any()), "List of directors");
// Add calculated fields to a type
demoSchema.Type <Person>().AddField("name", l => $"{l.FirstName} {l.LastName}", "Person's name");
// really poor example of using services e.g. you should just do below but pretend the service does something crazy like calls an API
// demoSchema.Type<Person>().AddField("age", l => (int)((DateTime.Now - l.Dob).TotalDays / 365), "Show the person's age");
// AgeService needs to be added to the ServiceProvider
demoSchema.Type <Person>().AddField("age", person => ArgumentHelper.WithService((AgeService ageService) => ageService.Calc(person)), "Show the person's age");
// replace fields. e.g. remove a many-to-many relationships
demoSchema.Type <Movie>().ReplaceField("actors", m => m.Actors.Select(a => a.Person), "Actors in the movie");
demoSchema.Type <Movie>().ReplaceField("writers", m => m.Writers.Select(a => a.Person), "Writers in the movie");
demoSchema.Type <Person>().ReplaceField("writerOf", m => m.WriterOf.Select(a => a.Movie), "Movies they wrote");
demoSchema.Type <Person>().ReplaceField("actorIn", m => m.ActorIn.Select(a => a.Movie), "Movies they acted in");
var dto = demoSchema.AddType <PersonPagination>(nameof(PersonPagination), "Actor Pagination");
dto.AddField("total", x => x.Total, "total records to match search");
dto.AddField("pageCount", x => x.PageCount, "total pages based on page size");
dto.AddField("people", x => x.People, "collection of people");
demoSchema.AddField("actorPager",
new { page = 1, pagesize = 10, search = "" },
(db, p) => PaginateActors(db, p),
"Pagination. [defaults: page = 1, pagesize = 10]",
"PersonPagination");
// add some mutations (always last, or after the types they require have been added)
demoSchema.AddMutationFrom(new DemoMutations());
demoSchema.AddInputType <Detail>("Detail", "Detail item").AddAllFields();
File.WriteAllText("schema.graphql", demoSchema.GetGraphQLSchema());
return(demoSchema);
}
