How could I propagate an mapped error

[mr-gilberto]

I would like to map the error in the repository instead of the viewModel, so I would like to add a mapper for it . and just access to the new Object mapped directly on the viewModel.

class UserRepositoryImpl @Inject constructor(
    private val userService: IntegraService,
    private val appDispatchers: AppDispatchers,
) : UserRepository {

    override suspend fun getUser(): ApiResponse<UserEntity> = withContext(appDispatchers.IO) {
        val response = userService.getUser()
        response.mapSuccess {
            toDomain()
        } 
        // Here I would like to map the error in the repository and return the ApiREsponse  all the app
    }
}

is it a good approach ? ,

[faraz152]

you can map the error before returning from the repository using mapFailure or a when expression on the response:

override suspend fun getUser(): ApiResponse<User> =
    userService.getUser()
        .mapFailure { failure ->
            MappedError(failure.message())
        }

or if you want full control:

return when (val result = userService.getUser()) {
    is ApiResponse.Success -> result
    is ApiResponse.Failure.Error -> ApiResponse.Failure.Error(MappedError(result.message()))
    is ApiResponse.Failure.Exception -> result
}

that way the viewmodel just sees the already-mapped type and does not need to know about the raw error shape.