Make hello world message

[mckelveygreg]

Back:
@daved, What does the hello world message look like to an outsider?

Front:
@nqthqn, what needs to be set up in Elm if we are to communicate with @daved 's hello world message branch?

[nqthqn]

You would make a command and then ask Elm to run it for you -

import Http

type Msg
  = GotHello (Result Http.Error String)

getHello : Cmd Msg
getHello =
  Http.get
    { url = "/hello"
    , expect = Http.expectString GotHello
    }

Note - not sure on the url and instead of String you would use a generated type alias and decoder from an Entity/ module.

To run the command,

init = 
    (model, getHello)

To react to the response from the command:

update msg model =
    case msg of
        GotHello (Ok response) ->
            ({ model | hello = response }, Cmd.none)

        GotHello (Err _) ->
            ({ model | hello = "uh oh" }, Cmd.none)

You could of course pattern match on the Http.Error and give the user more than just "uh oh".

[daved]

Closed in favor of #76