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[Bug][Kotlin-Spring] Wrong parameter type for multipart-form-data file upload when using kotlin-spring with reactive #21655

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[Bug][Kotlin-Spring] Wrong parameter type for multipart-form-data file upload when using kotlin-spring with reactive #21655

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35bb92c
[kotlin-spring] remove file type specific templating in optionalDataT…
cgual-omnidian Jul 15, 2025
8fe8490
[kotlin-spring] move non-reactive file param template into its own pa…
cgual-omnidian Jul 16, 2025
9665ea9
[kotlin-spring] reference non-reactive fil param template in delegate…
cgual-omnidian Jul 16, 2025
2c296fe
[kotlin-spring] fix spec errors in petstore-with-tags.yaml
cgual-omnidian Jul 16, 2025
ffd69fe
[kotlin-spring] add form params specific unit test cribbed from Sprin…
cgual-omnidian Jul 16, 2025
6449fd6
[kotlin-spring] add file parameter template which supports reactive f…
cgual-omnidian Jul 16, 2025
a8e2cd8
Streamline tests
cgual-omnidian Jul 29, 2025
8ba6f0c
Fixup imports
cgual-omnidian Jul 29, 2025
9a67862
Preserve newlines in delegate interfaces
cgual-omnidian Jul 29, 2025
8f0819c
Update samples
cgual-omnidian Jul 29, 2025
4bdd275
Cleanup template logic in apiDelegate.mustache for readability
cgual-omnidian Jul 29, 2025
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2 changes: 1 addition & 1 deletion modules/openapi-generator/src/main/resources/kotlin-spring/apiDelegate.mustache
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Expand Up @@ -33,7 +33,7 @@ interface {{classname}}Delegate {
/**
* @see {{classname}}#{{operationId}}
*/
{{#reactive}}{{^isArray}}suspend {{/isArray}}{{#isArray}}{{^useFlowForArrayReturnType}}suspend {{/useFlowForArrayReturnType}}{{/isArray}}{{/reactive}}fun {{operationId}}({{#allParams}}{{{paramName}}}: {{^reactive}}{{>optionalDataType}}{{/reactive}}{{#reactive}}{{^isArray}}{{>optionalDataType}}{{/isArray}}{{#isArray}}{{#isBodyParam}}Flow<{{{baseType}}}>{{/isBodyParam}}{{^isBodyParam}}{{>optionalDataType}}{{/isBodyParam}}{{/isArray}}{{/reactive}}{{^-last}},
{{#reactive}}{{^isArray}}suspend {{/isArray}}{{#isArray}}{{^useFlowForArrayReturnType}}suspend {{/useFlowForArrayReturnType}}{{/isArray}}{{/reactive}}fun {{operationId}}({{#allParams}}{{{paramName}}}: {{#isFile}}{{>fileParamType}}{{/isFile}}{{^isFile}}{{#reactive}}{{^isArray}}{{>optionalDataType}}{{/isArray}}{{#isArray}}{{#isBodyParam}}Flow<{{{baseType}}}>{{/isBodyParam}}{{^isBodyParam}}{{>optionalDataType}}{{/isBodyParam}}{{/isArray}}{{/reactive}}{{^reactive}}{{>optionalDataType}}{{/reactive}}{{/isFile}}{{^-last}},
{{/-last}}{{/allParams}}): {{#responseWrapper}}{{.}}<{{/responseWrapper}}ResponseEntity<{{>returnTypes}}>{{#responseWrapper}}>{{/responseWrapper}}{{^skipDefaultDelegateInterface}} {
{{>methodBody}}{{! prevent indent}}
}{{/skipDefaultDelegateInterface}}
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1 change: 1 addition & 0 deletions modules/openapi-generator/src/main/resources/kotlin-spring/fileParamType.mustache
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@@ -0,0 +1 @@
{{#isFile}}{{#reactive}}{{#isArray}}Flux<{{/isArray}}org.springframework.http.codec.multipart.Part{{#isArray}}>{{/isArray}}{{^required}}?{{/required}}{{/reactive}}{{^reactive}}{{#isArray}}Array<{{/isArray}}org.springframework.web.multipart.MultipartFile{{#isArray}}>{{/isArray}}{{^required}}?{{/required}}{{/reactive}}{{/isFile}}
2 changes: 1 addition & 1 deletion modules/openapi-generator/src/main/resources/kotlin-spring/formParams.mustache
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@@ -1 +1 @@
{{#isFormParam}}{{^isFile}}{{#swagger2AnnotationLibrary}}@Parameter(description = "{{{description}}}"{{#required}}, required = true{{/required}}{{#allowableValues}}{{#defaultValue}}, schema = Schema(allowableValues = [{{#values}}"{{{.}}}"{{^-last}}, {{/-last}}{{/values}}]{{^isContainer}}, defaultValue = {{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{{defaultValue}}}{{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{/isContainer}}){{/defaultValue}}{{/allowableValues}}{{#allowableValues}}{{^defaultValue}}, schema = Schema(allowableValues = [{{#values}}"{{{.}}}"{{^-last}}, {{/-last}}{{/values}}]){{/defaultValue}}{{/allowableValues}}{{^allowableValues}}{{#defaultValue}}{{^isContainer}}, schema = Schema(defaultValue = {{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{{defaultValue}}}{{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}){{/isContainer}}{{/defaultValue}}{{/allowableValues}}){{/swagger2AnnotationLibrary}}{{#swagger1AnnotationLibrary}}@ApiParam(value = "{{{description}}}"{{#required}}, required = true{{/required}}{{#allowableValues}}, allowableValues = "{{#values}}{{{.}}}{{^-last}}, {{/-last}}{{/values}}"{{/allowableValues}}{{#defaultValue}}, defaultValue = "{{{.}}}"{{/defaultValue}}){{/swagger1AnnotationLibrary}} {{#useBeanValidation}}@Valid{{/useBeanValidation}} {{#isModel}}@RequestPart{{/isModel}}{{^isModel}}@RequestParam{{/isModel}}(value = "{{baseName}}"{{#required}}, required = true{{/required}}{{^required}}, required = false{{/required}}) {{{paramName}}}: {{>optionalDataType}} {{/isFile}}{{#isFile}}{{#swagger2AnnotationLibrary}}@Parameter(description = "{{{description}}}"){{/swagger2AnnotationLibrary}}{{#swagger1AnnotationLibrary}}@ApiParam(value = "file detail"){{/swagger1AnnotationLibrary}} {{#useBeanValidation}}@Valid{{/useBeanValidation}} @RequestPart("{{baseName}}"{{#required}}, required = true{{/required}}{{^required}}, required = false{{/required}}) {{{paramName}}}: {{>optionalDataType}}{{/isFile}}{{/isFormParam}}
{{#isFormParam}}{{^isFile}}{{#swagger2AnnotationLibrary}}@Parameter(description = "{{{description}}}"{{#required}}, required = true{{/required}}{{#allowableValues}}{{#defaultValue}}, schema = Schema(allowableValues = [{{#values}}"{{{.}}}"{{^-last}}, {{/-last}}{{/values}}]{{^isContainer}}, defaultValue = {{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{{defaultValue}}}{{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{/isContainer}}){{/defaultValue}}{{/allowableValues}}{{#allowableValues}}{{^defaultValue}}, schema = Schema(allowableValues = [{{#values}}"{{{.}}}"{{^-last}}, {{/-last}}{{/values}}]){{/defaultValue}}{{/allowableValues}}{{^allowableValues}}{{#defaultValue}}{{^isContainer}}, schema = Schema(defaultValue = {{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}{{{defaultValue}}}{{^isString}}"{{/isString}}{{#isString}}{{#isEnum}}"{{/isEnum}}{{/isString}}){{/isContainer}}{{/defaultValue}}{{/allowableValues}}){{/swagger2AnnotationLibrary}}{{#swagger1AnnotationLibrary}}@ApiParam(value = "{{{description}}}"{{#required}}, required = true{{/required}}{{#allowableValues}}, allowableValues = "{{#values}}{{{.}}}{{^-last}}, {{/-last}}{{/values}}"{{/allowableValues}}{{#defaultValue}}, defaultValue = "{{{.}}}"{{/defaultValue}}){{/swagger1AnnotationLibrary}} {{#useBeanValidation}}@Valid{{/useBeanValidation}} {{#isModel}}@RequestPart{{/isModel}}{{^isModel}}@RequestParam{{/isModel}}(value = "{{baseName}}"{{#required}}, required = true{{/required}}{{^required}}, required = false{{/required}}) {{{paramName}}}: {{>optionalDataType}} {{/isFile}}{{#isFile}}{{#swagger2AnnotationLibrary}}@Parameter(description = "{{{description}}}"){{/swagger2AnnotationLibrary}}{{#swagger1AnnotationLibrary}}@ApiParam(value = "file detail"){{/swagger1AnnotationLibrary}} {{#useBeanValidation}}@Valid{{/useBeanValidation}} @RequestPart("{{baseName}}"{{#required}}, required = true{{/required}}{{^required}}, required = false{{/required}}) {{{paramName}}}: {{>fileParamType}}{{/isFile}}{{/isFormParam}}
2 changes: 1 addition & 1 deletion modules/openapi-generator/src/main/resources/kotlin-spring/optionalDataType.mustache
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@@ -1 +1 @@
{{^isFile}}{{{dataType}}}{{^required}}{{^defaultValue}}?{{/defaultValue}}{{/required}}{{/isFile}}{{#isFile}}{{#isArray}}Array<{{/isArray}}org.springframework.web.multipart.MultipartFile{{#isArray}}>{{/isArray}}{{^isArray}}{{^required}}?{{/required}}{{/isArray}}{{/isFile}}
{{{dataType}}}{{^required}}{{^defaultValue}}?{{/defaultValue}}{{/required}}
2 changes: 1 addition & 1 deletion modules/openapi-generator/src/main/resources/kotlin-spring/service.mustache
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Expand Up @@ -30,7 +30,7 @@ interface {{classname}}Service {
{{/externalDocs}}
* @see {{classname}}#{{operationId}}
*/
{{#reactive}}{{^isArray}}suspend {{/isArray}}{{#isArray}}{{^useFlowForArrayReturnType}}suspend {{/useFlowForArrayReturnType}}{{/isArray}}{{/reactive}}fun {{operationId}}({{#allParams}}{{{paramName}}}: {{^isBodyParam}}{{>optionalDataType}}{{/isBodyParam}}{{#isBodyParam}}{{^reactive}}{{>optionalDataType}}{{/reactive}}{{#reactive}}{{^isArray}}{{>optionalDataType}}{{/isArray}}{{#isArray}}Flow<{{{baseType}}}>{{/isArray}}{{/reactive}}{{/isBodyParam}}{{^-last}}, {{/-last}}{{/allParams}}): {{>returnTypes}}
{{#reactive}}{{^isArray}}suspend {{/isArray}}{{#isArray}}{{^useFlowForArrayReturnType}}suspend {{/useFlowForArrayReturnType}}{{/isArray}}{{/reactive}}fun {{operationId}}({{#allParams}}{{{paramName}}}: {{^isBodyParam}}{{#isFile}}{{>fileParamType}}{{/isFile}}{{^isFile}}{{>optionalDataType}}{{/isFile}}{{/isBodyParam}}{{#isBodyParam}}{{^reactive}}{{>optionalDataType}}{{/reactive}}{{#reactive}}{{^isArray}}{{>optionalDataType}}{{/isArray}}{{#isArray}}Flow<{{{baseType}}}>{{/isArray}}{{/reactive}}{{/isBodyParam}}{{^-last}}, {{/-last}}{{/allParams}}): {{>returnTypes}}
{{/operation}}
}
{{/operations}}
2 changes: 1 addition & 1 deletion modules/openapi-generator/src/main/resources/kotlin-spring/serviceImpl.mustache
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Expand Up @@ -11,7 +11,7 @@ import org.springframework.stereotype.Service
class {{classname}}ServiceImpl : {{classname}}Service {
{{#operation}}

override {{#reactive}}{{^isArray}}suspend {{/isArray}}{{#isArray}}{{^useFlowForArrayReturnType}}suspend {{/useFlowForArrayReturnType}}{{/isArray}}{{/reactive}}fun {{operationId}}({{#allParams}}{{{paramName}}}: {{^isBodyParam}}{{>optionalDataType}}{{/isBodyParam}}{{#isBodyParam}}{{^reactive}}{{>optionalDataType}}{{/reactive}}{{#reactive}}{{^isArray}}{{>optionalDataType}}{{/isArray}}{{#isArray}}Flow<{{{baseType}}}>{{/isArray}}{{/reactive}}{{/isBodyParam}}{{^-last}}, {{/-last}}{{/allParams}}): {{>returnTypes}} {
override {{#reactive}}{{^isArray}}suspend {{/isArray}}{{#isArray}}{{^useFlowForArrayReturnType}}suspend {{/useFlowForArrayReturnType}}{{/isArray}}{{/reactive}}fun {{operationId}}({{#allParams}}{{{paramName}}}: {{^isBodyParam}}{{#isFile}}{{>fileParamType}}{{/isFile}}{{^isFile}}{{>optionalDataType}}{{/isFile}}{{/isBodyParam}}{{#isBodyParam}}{{^reactive}}{{>optionalDataType}}{{/reactive}}{{#reactive}}{{^isArray}}{{>optionalDataType}}{{/isArray}}{{#isArray}}Flow<{{{baseType}}}>{{/isArray}}{{/reactive}}{{/isBodyParam}}{{^-last}}, {{/-last}}{{/allParams}}): {{>returnTypes}} {
TODO("Implement me")
}
{{/operation}}
Expand Down
158 changes: 128 additions & 30 deletions ...r/src/test/java/org/openapitools/codegen/kotlin/spring/KotlinSpringServerCodegenTest.java
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Expand Up @@ -5,8 +5,11 @@
import io.swagger.v3.oas.models.info.Info;
import io.swagger.v3.oas.models.servers.Server;
import io.swagger.v3.parser.core.models.ParseOptions;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Objects;
import java.util.function.Consumer;
import java.util.stream.Stream;
import org.apache.commons.io.FileUtils;
import org.assertj.core.api.Assertions;
import org.jetbrains.annotations.NotNull;
Expand Down Expand Up @@ -38,7 +41,6 @@
import static org.assertj.core.api.Assertions.assertThat;
import static org.openapitools.codegen.TestUtils.assertFileContains;
import static org.openapitools.codegen.TestUtils.assertFileNotContains;
import static org.openapitools.codegen.languages.SpringCodegen.SPRING_BOOT;
import static org.openapitools.codegen.languages.features.DocumentationProviderFeatures.ANNOTATION_LIBRARY;
import static org.openapitools.codegen.languages.features.DocumentationProviderFeatures.DOCUMENTATION_PROVIDER;

Expand Down Expand Up @@ -789,42 +791,138 @@ public void contractWithResolvedInnerEnumContainsEnumConverter() throws IOExcept
}

@Test
public void givenMultipartFormArray_whenGenerateDelegateAndService_thenParameterIsCreatedAsListOfMultipartFile() throws IOException {
File output = Files.createTempDirectory("test").toFile().getCanonicalFile();
output.deleteOnExit();
String outputPath = output.getAbsolutePath().replace('\\', '/');
public void givenNonRequiredMultipartFileArray_whenGenerateDelegateAndService_thenParameterIsCreatedAsNullableListOfMultipartFile() throws IOException {
Map<String, Object> additionalProperties = new HashMap<>();
additionalProperties.put(KotlinSpringServerCodegen.DELEGATE_PATTERN, true);
additionalProperties.put(KotlinSpringServerCodegen.SERVICE_IMPLEMENTATION, true);

Map<String, String> generatorPropertyDefaults = new HashMap<>();
generatorPropertyDefaults.put(CodegenConstants.MODELS, "false");
generatorPropertyDefaults.put(CodegenConstants.MODEL_TESTS, "false");
generatorPropertyDefaults.put(CodegenConstants.MODEL_DOCS, "false");
generatorPropertyDefaults.put(CodegenConstants.APIS, "true");
generatorPropertyDefaults.put(CodegenConstants.SUPPORTING_FILES, "false");

final OpenAPI openAPI = TestUtils.parseFlattenSpec("src/test/resources/3_0/kotlin/petstore-with-tags.yaml");
final KotlinSpringServerCodegen codegen = new KotlinSpringServerCodegen();
codegen.setOpenAPI(openAPI);
codegen.setOutputDir(output.getAbsolutePath());
codegen.setDelegatePattern(true);
codegen.setServiceInterface(true);
Map<String, File> files = generateFromContract(
"src/test/resources/3_0/kotlin/petstore-with-tags.yaml",
additionalProperties,
generatorPropertyDefaults
);

ClientOptInput input = new ClientOptInput();
input.openAPI(openAPI);
input.config(codegen);
validateMultipartFiles(
files,
"Pet",
"additionalMetadata: kotlin.String?",
"images: Array<org.springframework.web.multipart.MultipartFile>?)"
);
}

DefaultGenerator generator = new DefaultGenerator();
@Test
public void givenMultipartBinaryArray_whenGenerateDelegateAndService_correctMultipartFileIsCreated() throws IOException {
Map<String, Object> additionalProperties = new HashMap<>();
additionalProperties.put(KotlinSpringServerCodegen.DELEGATE_PATTERN, true);
additionalProperties.put(KotlinSpringServerCodegen.SERVICE_IMPLEMENTATION, true);

Map<String, String> generatorPropertyDefaults = new HashMap<>();
generatorPropertyDefaults.put(CodegenConstants.MODELS, "false");
generatorPropertyDefaults.put(CodegenConstants.MODEL_TESTS, "false");
generatorPropertyDefaults.put(CodegenConstants.MODEL_DOCS, "false");
generatorPropertyDefaults.put(CodegenConstants.APIS, "true");
generatorPropertyDefaults.put(CodegenConstants.SUPPORTING_FILES, "false");

generator.setGeneratorPropertyDefault(CodegenConstants.MODELS, "false");
generator.setGeneratorPropertyDefault(CodegenConstants.MODEL_TESTS, "false");
generator.setGeneratorPropertyDefault(CodegenConstants.MODEL_DOCS, "false");
generator.setGeneratorPropertyDefault(CodegenConstants.APIS, "true");
generator.setGeneratorPropertyDefault(CodegenConstants.SUPPORTING_FILES, "false");
Map<String, File> files = generateFromContract(
"src/test/resources/3_0/form-multipart-binary-array.yaml",
additionalProperties,
generatorPropertyDefaults
);

generator.opts(input).generate();
validateMultipartFiles(
files,
"MultipartArray",
"files: Array<org.springframework.web.multipart.MultipartFile>?)"
);

Path delegateFile = Paths.get(outputPath + "/src/main/kotlin/org/openapitools/api/PetApiDelegate.kt");
assertFileContains(delegateFile, "additionalMetadata: kotlin.String?");
assertFileContains(delegateFile, "images: Array<org.springframework.web.multipart.MultipartFile>");
validateMultipartFiles(
files,
"MultipartMixed",
"file: org.springframework.web.multipart.MultipartFile,",
"marker: MultipartMixedRequestMarker?",
"statusArray: kotlin.collections.List<MultipartMixedStatus>?"
);

Path controllerFile = Paths.get(outputPath + "/src/main/kotlin/org/openapitools/api/PetApi.kt");
assertFileContains(controllerFile, "images: Array<org.springframework.web.multipart.MultipartFile>");
validateMultipartFiles(
files,
"MultipartSingle",
"file: org.springframework.web.multipart.MultipartFile?"
);
}

@Test
public void givenMultipartBinaryArray_whenGenerateReactiveDelegateAndService_correctPartIsCreated() throws IOException {
Map<String, Object> additionalProperties = new HashMap<>();
additionalProperties.put(KotlinSpringServerCodegen.DELEGATE_PATTERN, true);
additionalProperties.put(KotlinSpringServerCodegen.SERVICE_IMPLEMENTATION, true);
additionalProperties.put(KotlinSpringServerCodegen.REACTIVE, true);

Map<String, String> generatorPropertyDefaults = new HashMap<>();
generatorPropertyDefaults.put(CodegenConstants.MODELS, "false");
generatorPropertyDefaults.put(CodegenConstants.MODEL_TESTS, "false");
generatorPropertyDefaults.put(CodegenConstants.MODEL_DOCS, "false");
generatorPropertyDefaults.put(CodegenConstants.APIS, "true");
generatorPropertyDefaults.put(CodegenConstants.SUPPORTING_FILES, "false");

Path serviceFile = Paths.get(outputPath + "/src/main/kotlin/org/openapitools/api/PetApiService.kt");
assertFileContains(serviceFile, "images: Array<org.springframework.web.multipart.MultipartFile>");
Map<String, File> files = generateFromContract(
"src/test/resources/3_0/form-multipart-binary-array.yaml",
additionalProperties,
generatorPropertyDefaults
);

validateMultipartFiles(
files,
"MultipartArray",
"files: Flux<org.springframework.http.codec.multipart.Part>?)"
);

validateMultipartFiles(
files,
"MultipartMixed",
"file: org.springframework.http.codec.multipart.Part,",
"marker: MultipartMixedRequestMarker?",
"statusArray: kotlin.collections.List<MultipartMixedStatus>?"
);

validateMultipartFiles(
files,
"MultipartSingle",
"file: org.springframework.http.codec.multipart.Part?"
);
}

/**
* Utility function to help validate that all delegate, service & api code generated for
* schemas with multipart-form-data have the same lines.
*/
private void validateMultipartFiles(
Map<String, File> files,
String filePrefix,
String... lines
) {
Stream.of(
filePrefix + "ApiDelegate.kt",
filePrefix + "ApiService.kt",
filePrefix + "ApiServiceImpl.kt",
filePrefix + "Api.kt"
)
.map(files::get)
.map(Objects::requireNonNull)
.map(File::toPath)
.forEach(path -> {
try {
TestUtils.assertFileContains(path, lines);
} catch (AssertionError e) {
throw new AssertionError(path.toString() + " does not contain a line", e);
}
});
}

@Test
Expand Down Expand Up @@ -887,7 +985,7 @@ public void givenMultipartForm_whenGenerateReactiveServer_thenParameterAreCreate
assertFileContains(outputFilepath,
"@Parameter(description = \"Additional data to pass to server\") @Valid @RequestParam(value = \"additionalMetadata\", required = false) additionalMetadata: kotlin.String?");
assertFileContains(outputFilepath,
"@Parameter(description = \"image to upload\") @Valid @RequestPart(\"image\", required = false) image: org.springframework.web.multipart.MultipartFile");
"@Parameter(description = \"image to upload\") @Valid @RequestPart(\"image\", required = false) image: org.springframework.web.multipart.MultipartFile?)");

}

Expand Down Expand Up @@ -1269,7 +1367,7 @@ private Map<String, File> generateFromContract(
.setAdditionalProperties(additionalProperties)
.setValidateSpec(false)
.setInputSpec(url)
.setLibrary(SPRING_BOOT)
.setLibrary(KotlinSpringServerCodegen.SPRING_BOOT)
.setOutputDir(output.getAbsolutePath());

consumer.accept(configurator);
Expand Down
16 changes: 7 additions & 9 deletions modules/openapi-generator/src/test/resources/3_0/kotlin/petstore-with-tags.yaml
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Expand Up @@ -267,16 +267,15 @@ paths:
content:
multipart/form-data:
schema:
type: object
properties:
additionalMetadata:
type: string
description: Additional data to pass to server
required: false
type: string
description: Additional data to pass to server
image:
type: string
description: image to upload
format: binary
required: true
type: string
description: image to upload
format: binary
responses:
200:
description: successful operation
Expand Down Expand Up @@ -306,18 +305,17 @@ paths:
content:
multipart/form-data:
schema:
type: object
properties:
additionalMetadata:
type: string
description: Additional data to pass to server
required: false
images:
type: array
items:
type: string
description: image to upload
format: binary
required: true
responses:
200:
description: successful operation
Expand Down
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