Hotwire Native for Rails Developers

Fetch and Parse JSON with a Model and a View Model

To make it easier to work with dynamic data, we can decode the JSON response into a concrete model. With the help of Decodable, you can parse this JSON with a single line of code.

Create a Model

Create a new Swift file in the Models folder and name it Hike. Inside, create a new struct with the properties from the JSON payload, conforming to the Decodable protocol.

ch05_11/ios/App/Models/Hike.swift

struct Hike: Decodable {
    let name: String
    let latitude: Double
    let longitude: Double
}

Remember how Marker in the view required a coordinate? To do this, create a computed property for Hike that exposes the latitude and longitude as a CLLocationCoordinate2D. Make sure to import ...