How to get error text with elm 0.19?

[PascalLeMerrer]

Hi

The documentation still contains:

Failure err -> text ("Error: " ++ toString err)

However toString is not available any more in elm 0.19. It was replaced with Debug.toString, String.fromInt and String.fromFloat. Debug.toString is not available outside of debug mode.

So how can I get the error now?

[tbash]

It will be up to the developer to create a custom toString for the error type being dealt with.
So if you have RemoteData Http.Error News (WebData News), you'll need to create the function: toString : Http.Error -> String.

[dawehner]

Seems like a good place for a package :)

[domenkozar]

Something like:

module Http.Extra exposing (errorToString)


import Http exposing (Error(..))
import Json.Decode as Json

parseError : String -> Maybe String
parseError =
    Json.decodeString (Json.field "error" Json.string) >> Result.toMaybe


errorToString : Http.Error -> String
errorToString err =
    case err of
        Timeout ->
            "Timeout exceeded"

        NetworkError ->
            "Network error"

        BadStatus resp ->
            parseError resp.body
                |> Maybe.withDefault (String.fromInt resp.status.code ++ " " ++ resp.status.message)

        BadPayload text resp ->
            "Unexpected response from api: " ++ text

        BadUrl url ->
            "Malformed url: " ++ url

[andys8]

With elm/[email protected] it's kind of what @domenkozar proposed, but there are two different return types, depending on how you're going to request data.

Error and Response

And the docs contain a similar example