Sample code for "Building RESTful Web APIs with Dart, Aqueduct and PostgreSQL (Part 3)" post on Medium (4)

books_controller.dart

@httpGet
Future<Response> getBook(@HTTPPath("index") int idx) async {
  var query = new Query<Book>()..where.id = whereEqualTo(idx);
  var book = await query.fetchOne();

  if (book == null) {
    return new Response.notFound(body: 'Book does not exist')
      ..contentType = ContentType.TEXT;
  }
  return new Response.ok(book);
}