requestExample.swift

let URL = "https://raw.githubusercontent.com/tristanhimmelman/AlamofireObjectMapper/2ee8f34d21e8febfdefb2b3a403f18a43818d70a/sample_keypath_json"
let expectation = expectationWithDescription("\(URL)")

Alamofire.request(.GET, URL).responseObject(keyPath: "data") { (response: Response<WeatherResponse, NSError>) in
    expectation.fulfill()

    let weatherResponse = response.result.value
    print(weatherResponse?.location)

    if let threeDayForecast = weatherResponse?.threeDayForecast {
        for forecast in threeDayForecast {
            print(forecast.day)
            print(forecast.temperature)           
        }
    }
}