[BUG] openapi-generator problem with nested oneOf?

Description

The openapi-generator client generation crashes on the provided OpenAPI document, which passes validation both using openapi-generator validate and linting using speccy. It seems to be language independent (affects all languages I tried).

openapi-generator version

4.0.0-beta3

OpenAPI declaration file content or url

Gist of JSON here: https://gist.github.com/einarwh/c8526951c3080ddca7b3b791066bb9e3

Command line used for generation

No fancy options, just: openapi-generator generate -i openapi.json -g csharp

Steps to reproduce

Save gist as e.g. openapi.json and run: openapi-generator validate -i openapi.json to verify that the document is valid and then openapi-generator generate -i openapi.json -g csharp to get error message complaining about ‘ResourceId’ model.

Related issues/PRs

Looks very similar to this: https://github.com/OpenAPITools/openapi-generator/issues/2610

Suggest a fix/enhancement

It seems that the problem is due to nested oneOf’s.

Issue Analytics

State:
Created 4 years ago
Comments:7 (3 by maintainers)

Top GitHub Comments

3reactions

kilimnikcommented, Dec 16, 2019

Is there someone working on supporting oneOf and anyOf to be generated by the C# client generator?

0reactions

arvindpdmncommented, Nov 15, 2022

The issue is beyond nested oneOf. Code generation fails if there’s an array within a oneOf. However, there’s no error if I change it to allOf or anyOf. Here’s a fancy example:

    MyBox:
      oneOf:
        - type: array
          items:
            $ref: 'Stationery.yaml#/components/schemas/Pencil'
          minItems: 1
        - $ref: '#/components/schemas/GeometryBox'

Error with generator 6.2.0:

Caused by: java.lang.RuntimeException: Could not generate model 'MyBox'
        at org.openapitools.codegen.DefaultGenerator.generateModels(DefaultGenerator.java:563)
        at org.openapitools.codegen.DefaultGenerator.generate(DefaultGenerator.java:912)
        at org.openapitools.generator.gradle.plugin.tasks.GenerateTask.doWork(GenerateTask.kt:770)
        ... 143 more
Caused by: java.lang.StringIndexOutOfBoundsException: begin 0, end 1, length 0
        at org.openapitools.codegen.templating.mustache.TitlecaseLambda.titleCase(TitlecaseLambda.java:64)
        at org.openapitools.codegen.templating.mustache.TitlecaseLambda.execute(TitlecaseLambda.java:80)
...

Generator options:

{
        globalProperties = [
            models: "",
            apis: ""
        ]
        generatorName = "csharp-netcore"
        inputSpec = <some-yaml-file>
        outputDir = "$buildDir/generated".toString()
        skipValidateSpec = true
        generateApiTests = false
        generateApiDocumentation = false
        generateModelTests = false
        generateModelDocumentation = false
        configOptions = [
            netCoreProjectFile: "true",
            nonPublicApi: "true",
            targetFramework: "net6.0"
        ]
    }