haskell-servant/example-servant-elm

Example for a web app with a servant backend and an elm frontend

example-servant-elm's Issues

Update Dependencies

I started to get this example running. Elm is in Version 0.17, not 0.18. When I tried to update elm I recognised the Api code is generated by elm-export and servant-elm. I think I could help update the elm code. The haskell server part is not too straight forward to update because there seem to be more breaking changes:

server/src/Api.hs:37:10: error:
    • No instance for (ElmType Integer)
        arising from a use of ‘elm-export-0.6.0.1:Elm.Type.$dmtoElmType’
    • In the expression: elm-export-0.6.0.1:Elm.Type.$dmtoElmType @Item
      In an equation for ‘toElmType’:
          toElmType = elm-export-0.6.0.1:Elm.Type.$dmtoElmType @Item
      In the instance declaration for ‘ElmType Item’
make[1]: *** [Api.elm] Error 1
make: *** [client-build] Error 2

Would be awesome if this example could be updated and work again.

Update to Elm 0.19.1

The update to Elm 0.19.1 is expected to be easy.

Get type error for server

I got a type error when I try to make it run. I checked the Network.Wai.MakeAssets you were using and it returns IO Application as well. Not sure how your example works.

      Expected type: IO (Server WithAssets)
        Actual type: IO (Server Api :<|> Application)

{-# LANGUAGE DataKinds #-}
{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE OverloadedStrings #-}

module App
    ( startApp
    ) where

import Control.Concurrent
import Control.Monad.IO.Class
import Control.Monad.Trans.Except
import Network.Wai
import Network.Wai.MakeAssets
import Network.Wai.Handler.Warp
import Servant

import Api

type WithAssets = Api :<|> Raw

withAssets :: Proxy WithAssets
withAssets = Proxy

startApp :: IO ()
startApp = run 8080 =<< app

app :: IO Application
app = serve withAssets <$> server

server :: IO (Server WithAssets)
server = do
  assets <- serveAssets def
  return $ apiServer :<|> assets

apiServer :: Server Api
apiServer = return users

users :: [User]
users =
  [ User "Isaac Newton"    372
  , User "Albert Einstein" 136
  ]

No cabal found

Hello, i'm having this error when running make:

$ make
(cd client ; elm package install -y)
Packages configured successfully!
stack setup
stack will use a locally installed GHC
For more information on paths, see 'stack path' and 'stack exec env'
To use this GHC and packages outside of a project, consider using:
stack ghc, stack ghci, stack runghc, or stack exec
stack test --only-dependencies
No .cabal file found in directory /project-path/example-servant-elm/
make: *** [server-setup] Error 1

don't we need a cabal for the haskell package to use stack?

Update to elm 0.19

Elm 0.19 is released. We have to wait for haskell-servant/servant-elm#44 to arrive. But otherwise this repository can be updated.

All Elm dependencies but elm-html-test were updated. It looks like elm-html-test is listed, but not used in the codebase.

https://kraklin.github.io/elm-readiness/