Swift quick start

Use the Fauna Core HTTP API to query e-commerce demo data using Swift.

Create a database with demo data
Log in to the Fauna Dashboard, and create a database with the following configuration:
- Region group: Choose your preferred region group, which determines where your data resides.
- Use demo data: Enabled.
- Enable backups: Disabled.
Leave the other options as is.
Create an authentication secret
Fauna supports several types of authentication secrets. Create a key, which is a type of secret, with the built-in server-readonly role:
1. In the Dashboard’s Explorer page, select your demo database.
2. In the database’s Keys tab, click Create Key.
3. Choose a Role of server (read-only).
4. Click Save.
5. Copy the Key Secret.
Set the FAUNA_SECRET environment variable

Set the FAUNA_SECRET environment variable to your key’s secret.
```
export FAUNA_SECRET=<KEY_SECRET>
```
Set up a Swift project
Create and navigate to a new directory for your app. Then initialize a Swift project:
mkdir app cd app swift package init --type executable

Create a basic app

In the app directory, replace the content of Sources/app/main.swift with the following code:

import Foundation

// Define the Query API endpoint and headers.
let url = URL(string: "https://db.fauna.com/query/1")!
let faunaSecret = ProcessInfo.processInfo.environment["FAUNA_SECRET"]!
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.addValue("Bearer \(faunaSecret)", forHTTPHeaderField: "Authorization")
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("simple", forHTTPHeaderField: "X-Format")

// Define the FQL query.
let queryPayload: [String: Any] = [
    "query": "Product.sortedByPriceLowToHigh() { name, description, price }"
]

do {
    // Set the request body with query.
    let jsonData = try JSONSerialization.data(withJSONObject: queryPayload, options: [])
    request.httpBody = jsonData
} catch {
    print("Failed to encode the JSON body: \(error)")
    exit(1)
}

// Make the HTTP request.
let task = URLSession.shared.dataTask(with: request) { data, response, error in
    if let error = error {
        print("Error: \(error)")
        return
    }

    guard let data = data else {
        print("No data received")
        return
    }

    do {
        // Output the response.
        let json = try JSONSerialization.jsonObject(with: data, options: []) as! [String: Any]
        let prettyJsonData = try JSONSerialization.data(withJSONObject: json, options: .prettyPrinted)
        if let prettyJson = String(data: prettyJsonData, encoding: .utf8) {
            print(prettyJson)
        }
    } catch {
        print("Failed to parse response: \(error)")
    }
}

// Start the task.
task.resume()

// Keep the program running to wait for the async response.
RunLoop.main.run()

Run the app

Run the app from the app directory.

swift run

The app prints the Query API’s response. The data property contains the results of the query:

{
  "summary" : "",
  "data" : {
    "data" : [
      {
        "name" : "single lime",
        "price" : 35,
        "description" : "Conventional, 1 ct"
      },
      {
        "name" : "cilantro",
        "price" : 149,
        "description" : "Organic, 1 bunch"
      },
      {
        "name" : "limes",
        "price" : 299,
        "description" : "Conventional, 16 oz bag"
      },
      {
        "name" : "organic limes",
        "price" : 349,
        "description" : "Organic, 16 oz bag"
      },
      {
        "name" : "avocados",
        "price" : 399,
        "description" : "Conventional Hass, 4ct bag"
      },
      {
        "name" : "pizza",
        "price" : 499,
        "description" : "Frozen Cheese"
      },
      {
        "name" : "cups",
        "price" : 698,
        "description" : "Translucent 9 Oz, 100 ct"
      },
      {
        "name" : "taco pinata",
        "price" : 2399,
        "description" : "Giant Taco Pinata"
      },
      {
        "name" : "donkey pinata",
        "price" : 2499,
        "description" : "Original Classic Donkey Pinata"
      }
    ]
  },
  ...
}