Using a data model

The data model used in the SQLite database is implemented in /Models/Todo.swift:

// File: /Sources/App/Models/Todo.swift
import FluentSQLite
import Vapor

/// A single entry of a Todo list.
final class Todo: SQLiteModel { // [1]
/// The unique identifier for this `Todo`.
var id: Int? // [2]

/// A title describing what this `Todo` entails.
var title: String // [3]

/// Creates a new `Todo`.
init(id: Int? = nil, title: String) { // [4]
self.id = id
self.title = title
}
}

/// Allows `Todo` to be used as a dynamic migration.
extension Todo: Migration { } // [5]

/// Allows `Todo` to be encoded to and decoded from HTTP messages.
extension Todo: Content { } // [6]

/// Allows `Todo` to be used as a dynamic parameter in route definitions.
extension Todo: Parameter { } // [7]

The data model is implemented as follows:

1. The final ToDo class is subclassing from the SQLiteModel class
2. The id...