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[BUG][KOTLIN-SPRING] Multipart file upload generate wrong type  #8333

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@notizklotz

Description

@notizklotz

Bug Report Checklist

  • Have you provided a full/minimal spec to reproduce the issue?
  • Have you validated the input using an OpenAPI validator (example)?
  • Have you tested with the latest master to confirm the issue still exists?
  • Have you searched for related issues/PRs?
  • What's the actual output vs expected output?
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Description

The kotlin-spring generator generates multipart file upload attributes as org.springframework.core.io.Resource which actually cannot be handled by Spring Boot. org.springframework.web.multipart.MultipartFile should be generated instead: Uploading files guide

The spring generator handles this case correctly by applying some special case handling in the Mustache templates.

openapi-generator version

openapi-generator-maven-plugin:5.0.0

OpenAPI declaration file content or url

Multipart file upload sample spec

Steps to reproduce
  1. Generate server code using the kotlin-spring generator
  2. Generate server code using the spring generator
  3. Note that the spring generator generates the file paramter as List<MultipartFile> while the kotlin-spring generator generates List<Resource>
Related issues/PRs
Suggest a fix

Apply the same special case handling in the templates like the spring generator

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