Auto-inject parameter of primitive data type into Singleton

[davidscheutz]

Feature Request

Currently it's not possible to directly inject parameters such as String, Int etc. using the AutoSetup protocol.

The following code will result in a crash:

/// @Singleton
class ApiClient {
   private let baseUrl: String

   init(baseUrl: String) {
      self.baseUrl = baseUrl
   }
}

Error: DependencyContainer.ResolveError<Swift.String>.notRegistered

Proposed Solution

DependencyContainer does already support injecting and resolving objects using a Key: AnyHashable.

The question is how to integrate that feature using the AutoSetup code generation?

[davidscheutz]

For now, there is a simple workaround available:

1. Create a wrapper type for your parameter(s)

Using the example above:

/// @Singleton
class ApiClient {
   struct Config {
      let baseUrl: String
   }

   init(config: Config) {
      self.baseUrl = config.baseUrl
   }
}

2. Manually register the wrapper type

Using the override function of your dependencies entry point:

struct YourDependencies: AutoSetup {
   func override(_ container: DependencyContainer) throws {
      container.register { ApiClient.Config(baseUrl: "{YOUR_API_URL}") }
   }
}

Hope that unblocks everyone for now! Will update this issue once support for this feature is available 🙌🏻