named-parameters-design.swift

r.get("posts", ":postID") { req in
    let postID = try req.parameters.get(":postID")
    print(postID) // String
    ...
}

enum PathComponent {
    case part(String)
    case dynamic(name: String)
    case anything
    case catchall
}

extension PathComponent: ExpressibleByStringLiteral {
    init(stringLiteral value: String) {
        if value.hasPrefix(":") {
            self = .dynamic(name: value[1...])
        } else if value == ":" { 
            self = .anything
        } else if value == "*" { 
            self = .catchall
        } else {
            self = .part(value)
        }
    }
}

extension PathComponent {
    static var postID: PathComponent {
        return ":postID"
    }
}

extension PathComponent {
    static var postID: PathComponent {
        return .dynamic(name: "postID")
    }
}

r.get("posts", .postID) { req in
    let postID = try req.parameters.get(.postID)
    print(postID) // String
    ...
}

try req.parameters.get(.postID, as: Int.self)


return try Post.find(req.parameters.get(.postID), on: self.db).first()