Hands-On Server-Side Web Development with Swift

Updating an item

The handler for editing a record follows the similar workflow as in the handler for entry retrieval, but takes an additional step to update the record with the intended changes:

func editEntry(_ req: Request) throws -> Future<JournalEntry> {    let id = try req.parameters.next(Int.self)    return try req.content.decode(JournalEntry.self).flatMap { updated in        return JournalEntry.find(id, on: req)            .flatMap(to: JournalEntry.self) { original in                guard let original = original else { throw Abort(.notFound) }                original.title = updated.title                original.content = updated.content                return original.save(on: req)        }        }}

In the preceding code, the id is retrieved first using parameters.next(Int.self), and then a query using find(on:) is issued to retrieve ...