PathHierarchy.swift

enum Root {}
enum ChatRooms {}
enum ChatRoom {}
enum Messages {}

struct Message: Codable {
    // Our Message entity
    var header: String
    var body: String
}

struct Configuration: Codable {
    // Our actual Configuration entity
    var welcomeMessage: String
}

extension Path where Element == Root {
    init() {
        self.init([])
    }
}

extension Path where Element == Root {
    var chatrooms: Path<ChatRooms> {
        return append("chatrooms")
    }
    var configuration: Path<Configuration> {
        return append("configuration")
    }
}

extension Path where Element == ChatRooms {
    func chatRoom(_ key: String) -> Path<ChatRoom> {
        return append(key)
    }
}

extension Path where Element == ChatRoom {
    var name: Path<String> {
        return append("name")
    }
    var messages: Path<Messages> {
        return append("messages")
    }
}

extension Path where Element == Messages {
    func message(_ key: String) -> Path<Message> {
        return append("message")
    }
}