Support for default values in Request about papyrus

[joshuawright11]

Thanks for suggestion @PangMo5 - I'd definitely love if we could support this!

At one point I actually had the @Default functionality as you suggested but unfortunately we lost the ability to do that in the Xcode 15 Beta update that post you linked is about.

Also unfortunately, Swift doesn't support either default arguments (your first example) or property wrappers (potential other implementation) in protocol definitions yet. I don't believe there is another way to do it, otherwise I'd be very open to it. If you have any ideas of how this could be accomplished let me know!

For now, however, you can achieve the desired effect using (albeit verbose) extensions.

@API
protocol Users {
  @GET("/users")
  func getList(size: Int, cursor: String?) async throws -> [User]

  @POST("/user")
  func createUser(email: String, password: String, nickname: String?) async throws
}

// note that the @GET / other macros aren't needed in the extension.
extension Users {
    func getList(size: Int = 20, cursor: String?) async throws -> [User] {
        try await getList(size: size, cursor: cursor)
    }

    func createUser(email: String, password: String, nickname: String? = nil) async throws {
        try await createUser(email: email, password: password, nickname: nickname)
    }
}

Again - this is pretty verbose and I think your first example is the ideal solution, but default arguments aren't currently allowed in protocols.

[ypotsiah]

@joshuawright11 ,
Is it possible to generate such Users extension by something like that?

@API
protocol Users {
  @GET("/users", defaults: ["size": 20])
  func getList(size: Int, cursor: String?) async throws -> [User]

  @POST("/user", defaults: ["nickname": nil])
  func createUser(email: String, password: String, nickname: String?) async throws
}

Looks not very type safe but probably we can match keys from defaults with endpoint's ages and verify values with appropriate types as well (and throw error if needed).