I've created a post about this decoder problem, I hope it helps other
people:
https://medium.com/@adrian_ribao/recursive-decoders-on-elm-to-manage-server-side-validation-errors-82bee47cc38c
El lunes, 27 de marzo de 2017, 12:37:38 (UTC+2), Adrian Ribao escribió:
>
> Hello,
>
> I'm creating a library to manage persistence with an Elixir backend using
> Phoenix Framework. In Phoenix, invalid fields are returned like this:
>
> { "errors" :
> field_name: ["list", "of", "errors"]
> }
>
> And when you are working with nested relations, errors are like:
>
> { "errors" :
> nested_form: [
> {name: ["Name too short"]}
> ]
> }
>
> For each field name, instead of getting a list of strings, now you get a
> dict with a list of strings.
>
> The two kind of errors may appear in the same json:
>
> { "errors" :
> field_name: ["This field is not valid"],
> nested_form: [
> {name: ["Name too short"]}
> ]
> }
>
> I've created a recursive decoder, you can see it here:
> https://ellie-app.com/LdLVZWNJHfa1/11
>
> But event though it compiles, using the lazy function raises a runtime
> exception.
>
> Is this a bug or I'm implementing it wrong?
>
> Thanks,
>
> Adrián
>
>
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