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httpリクエストから入ってきたjsonをデコードしようとしていますが、私は構文上の問題を抱えています。これは私がコンパイラから取得エラーです:ここではElm Json Decoderパイプラインエラー
-- TYPE MISMATCH ------------------------------------------------------ [7/1811$
The 2nd argument to function `send` is causing a mismatch.
65| Http.send CardFetch (Http.get url modelDecoder)
^^^^^^^^^^^^^^^^^^^^^^^^^
Function `send` is expecting the 2nd argument to be:
Http.Request String
But it is:
Http.Request Model
は私のコードです:
module Main exposing (..)
import Html exposing (..)
import Html.Attributes exposing (..)
import Html.Events exposing (..)
import Http
import Json.Decode as Decode exposing (string, Decoder, at, index)
import Json.Decode.Pipeline exposing (..)
main : Program Never Model Msg
main =
program
{ init = init
, view = view
, update = update
, subscriptions = subscriptions
}
type alias Model =
{ boardName : String
, cardName : String
}
init =
(Model "Default Board" "Default Card"
, Cmd.none
)
-- UPDATE
type Msg
= CardFetch (Result Http.Error String)
| DataFetch
update : Msg -> Model -> (Model, Cmd Msg)
update msg model =
case msg of
DataFetch ->
(model, getData)
CardFetch (Ok incomingName) ->
(Model model.cardName incomingName, Cmd.none)
CardFetch (Err errorMessage) ->
(model, Debug.log "Errors" Cmd.none)
-- HTTP
url : String
url =
"https://api.trello.com/1/members/user/actions?limit=3&key=..."
getData =
Http.send CardFetch (Http.get url modelDecoder)
{--decodeCard =
Decode.index 0
modelDecoder
(Decode.at
[ "data", "card", "name" ]
string
)
--}
modelDecoder : Decoder Model
modelDecoder =
decode Model
|> custom (index 0 (at [ "data", "card", "name" ] string))
|> custom (index 0 (at [ "data", "board", "name" ] string))
--UPDATE
-- VIEW
view : Model -> Html Msg
view model =
div []
[ div []
[ button [ onClick DataFetch ] [ text "Get Card" ] ]
, div [ class "card" ]
[ h3 [] [ text model.boardName ]
, div [ class "board" ] [ h4 [] [ text model.cardName ] ]
]
]
-- SUBSCRIPTIONS
subscriptions : Model -> Sub Msg
subscriptions model =
Sub.none
私はエルムにかなり新しいですし、私はAPI呼び出しがどのように動作するかを把握しようとしています。 Elmのドキュメントは優れていますが、API呼び出しに関するビットはあいまいです。私が得ることができるすべての助けに感謝します。どうもありがとう!