[WIP] [Elm] Fix elm code generation for array type request param

[sayanarijit]

Enclose array values inside ().

e.g.

From:

getArticles : Maybe List ArticleCategory -> Api.Request ()

To:

getArticles : Maybe (List ArticleCategory) -> Api.Request ()

Fixes: #7889

PR checklist

• Read the contribution guidelines.
• Pull Request title clearly describes the work in the pull request and Pull Request description provides details about how to validate the work. Missing information here may result in delayed response from the community.
• If contributing template-only or documentation-only changes which will change sample output, build the project beforehand.
• Run the shell script ./bin/generate-samples.shto update all Petstore samples related to your fix. This is important, as CI jobs will verify all generator outputs of your HEAD commit as it would merge with master. These must match the expectations made by your contribution. You may regenerate an individual generator by passing the relevant config(s) as an argument to the script, for example ./bin/generate-samples.sh bin/configs/java*. For Windows users, please run the script in Git BASH.
• File the PR against the correct branch: master
• Copy the technical committee to review the pull request if your PR is targeting a particular programming language.

[sayanarijit]

cc @eriktim

[sayanarijit]

Ok It generates Maybe (List ArticleCategory) -> Api.Request () but we actually need Maybe (List Api.Data.ArticleCategory) -> Api.Request (). i.e. isModel for the item should be true.

[sayanarijit]

Not yet fixed.

It generates:

module Api.Request.Default exposing
    ( getArticles
    )

import Api
import Api.Data
import Dict
import Http
import Json.Decode
import Json.Encode


getArticles : Maybe (List Api.Data.ArticleCategory) -> Api.Request ()
getArticles category_query =
    Api.request
        "GET"
        "/articles"
        []
        [ ( "category", Maybe.map (String.join "," << List.map stringFrom) category_query ) ]
        []
        Nothing
        (Json.Decode.succeed ())

[Erudition]

That looks fixed to me!

[sayanarijit]

I think there are still some edge cases. However, I think those are easily avoidable. Due to poor time management skills, I'm not able to continue working on this PR, hence closing this. Feel free to take over though.