如何在Json.Decoder中将String转换为Int

问题描述：

这是我的解码器:

decodeData : Json.Decoder (Id, String)
decodeData =
  Json.at ["data", "0"]
    <| Json.object2 (,)
      ("id" := Json.int)
      ("label" := Json.string)

id在逻辑上应为Int，但是我的后端将其作为String发送(例如，我们得到了"1"而不是1).

The id should logically be Int however my backend sends it as String (e.g. we get "1" instead of 1).

如何将解码后的值转换为Int?

How can I cast the decoded value to Int?

答

...并回答自己:)我在

... and to answer myself :) I found the solution in this Flickr example

decodeData : Json.Decoder (Id, String)
decodeData =
  let number =
    Json.oneOf [ Json.int, Json.customDecoder Json.string String.toInt ]
  in
    Json.at ["data", "0"]
      <| Json.object2 (,)
        ("id" := number)
        ("label" := Json.string)

如何在Json.Decoder中将String转换为Int

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