https://github.com/sochalewski/easycodable

Easy failable properties in Swift Codable.
https://github.com/sochalewski/easycodable

codable json swift

Last synced: about 2 months ago
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Easy failable properties in Swift Codable.

• Host: GitHub
• URL: https://github.com/sochalewski/easycodable
• Owner: sochalewski
• License: mit
• Created: 2022-07-09T12:10:11.000Z (over 2 years ago)
• Default Branch: main
• Last Pushed: 2023-11-09T00:43:12.000Z (about 1 year ago)
• Last Synced: 2024-10-30T17:24:28.543Z (about 2 months ago)
• Topics: codable, json, swift
• Language: Swift
• Homepage:
• Size: 15.6 KB
• Stars: 3
• Watchers: 2
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# EasyCodable

Easy failable optional enum properties in Swift Codable.

## Installation

You can add EasyCodable to an Xcode project by adding it as a package dependency.

  1. From the **File** menu, select **Add Packages…**

  2. Enter `https://github.com/sochalewski/EasyCodable` into the package repository URL text field.

  3. Add the package to your app target.

## Why?

Consider the following data model:

```swift

struct Car: Codable {

    enum Manufacturer: String, Codable {

        case toyota, volkswagen, ford, honda, generalMotors

    }

    

    var manufacturer: Manufacturer?

    var vin: String?

    var owner: String?

}

```

Everything works perfectly if the received JSON matches the available `Manufacturer` enum values, like this:

```json

{

    "manufacturer": "toyota",

    "vin": "JT4RN67S0G0002845",

    "owner": null

}

```

But `Car.manufacturer` is optional, so it makes sense to have a valid model, even if the received manufacturer doesn't match one of the currently supported ones:

```json

{

    "manufacturer": "tesla",

    "vin": "5YJSA2DP8DFP22249",

    "owner": "Elon Musk"

}

```

Unfortunately decoding this with `JSONDecoder` results in getting `nil` for the whole `Car` instead of just `Car.manufacturer`.

This can be solved by custom `init(from:)` of the `Decodable` protocol, but that's a lot of boilerplate, especially when you have dozens of enums in your models.

This is where EasyCodable comes in!

## Usage

Just add the `@EasyNil` property wrapper to your optional `RawRepresentable` properties.

```swift

struct Car: Codable, Equatable {

    enum Manufacturer: String, Codable {

        case toyota, volkswagen, ford, honda, generalMotors

    }

    

    @EasyNil var manufacturer: Manufacturer?

    var vin: String?

    var owner: String?

}

```

## Author

Piotr Sochalewski, sochalewski.github.io