Updating an entry

The handler for updating an entry is the second handler belonging to the /journal/Int.parameter route group:

func editEntry(_ req: Request) throws -> Future<HTTPStatus> { 
    let index = try req.parameters.next(Int.self)
    let newID = UUID().uuidString
    return try req.content.decode(Entry.self).map(to: HTTPStatus.self) { entry in // [1]
        let newEntry = Entry(id: newID,
                             title: entry.title,
                             content: entry.content)
        guard let result = self.journal.update(index: index, entry: newEntry) else {
            throw Abort(.badRequest)
        }
        print("Updated: \(result)")
        return .ok
    }
}

The line at [1] shows that the JSON object is decoded and serialized into an Entry object, and then an array containing HTTPStatus is returned from the mapping of a result using map(to:).