Hands-On Server-Side Web Development with Swift

Implementing endpoint logic in controllers

The TodoController class introduced previously is declared in TodoController.swift:

// File: /Sources/App/Controllers/TodoController.swiftimport Vapor/// Controlers basic CRUD operations on `Todo`s.final class TodoController { // [1]/// Returns a list of all `Todo`s.func index(_ req: Request) throws -> Future<[Todo]> { // [2]return Todo.query(on: req).all()}/// Saves a decoded `Todo` to the database.func create(_ req: Request) throws -> Future<Todo> {return try req.content.decode(Todo.self).flatMap { todo in // [3]return todo.save(on: req)}}/// Deletes a parameterized `Todo`.func delete(_ req: Request) throws -> Future<HTTPStatus> {return try req.parameters.next(Todo.self).flatMap { todo in // ...