Hands-On Server-Side Web Development with Swift

Retrieving an entry

The handlers in the route group /journal/Int.parameter deal with a specific entry. The first handler belonging to this route group is getEntry():

func getEntry(_ req: Request) throws -> Entry {     let index = try req.parameters.next(Int.self) // [1]    let res = req.makeResponse() // [2]    guard let entry = journal.read(index: index) else {        throw Abort(.badRequest)    }    print("Read: \(entry)")    try res.content.encode(entry, as: .formData) // [3]    return entry}

There are several interesting steps in the preceding implementation:

1. Retrieve the index of an Entry object, using the req.parameters.next() command
2. Create a response instance by calling the makeResponse() method
3. Serialize the Entry object that conforms to Content into a JSON ...