Int Array not working with FormData

[cruiserkernan]

If I use an array of integer in formdata i receive a 400 error ["The value '"1","2"' is not valid."]}
This happens when i try the api from the Swagger UI.

Anyone knows if this is a bug or if I am misssing something?

[RicoSuter]

With a client generated with the C# generator? Or how to do you get this request?

[cruiserkernan]

We are using aspNetCoreToSwagger and in startup running useSwagger3UI. The swagger specification is generated with nswag.MSBuild.

This is the generated specification for this parameter:

         {
            "type": "array",
            "name": "ids",
            "in": "formData",
            "collectionFormat": "multi",
            "x-nullable": false,
            "items": {
              "type": "integer",
              "format": "int32"
            }
          },

I am testing the api using swagger UI.

This generates the request for this int array parameter as: "1","2"

This is the nswag-file:

{
  "runtime": "NetCore21",
  "defaultVariables": null,
  "swaggerGenerator": {
    "aspNetCoreToSwagger": {
      "project": "Web.csproj",
      "msBuildProjectExtensionsPath": null,
      "configuration": null,
      "runtime": null,
      "targetFramework": "",
      "noBuild": true,
      "verbose": false,
      "workingDirectory": null,
      "requireParametersWithoutDefault": false,
      "apiGroupNames": null,
      "defaultPropertyNameHandling": "CamelCase",
      "defaultReferenceTypeNullHandling": "NotNull",
      "defaultEnumHandling": "Integer",
      "flattenInheritanceHierarchy": false,
      "generateKnownTypes": true,
      "generateXmlObjects": false,
      "generateAbstractProperties": false,
      "ignoreObsoleteProperties": false,
      "allowReferencesWithProperties": false,
      "excludedTypeNames": [],
      "serviceHost": null,
      "serviceBasePath": null,
      "serviceSchemes": [],
      "infoTitle": "***",
      "infoDescription": null,
      "infoVersion": "1.0.0",
      "documentTemplate": null,
      "documentProcessorTypes": [],
      "operationProcessorTypes": [],
      "typeNameGeneratorType": null,
      "schemaNameGeneratorType": null,
      "contractResolverType": null,
      "serializerSettingsType": null,
      "useDocumentProvider": false,
      "documentName": "v1",
      "aspNetCoreEnvironment": null,
      "createWebHostBuilderMethod": null,
      "startupType": null,
      "allowNullableBodyParameters": true,
      "output": "******",
      "outputType": "Swagger2",
      "assemblyPaths": [],
      "assemblyConfig": null,
      "referencePaths": [],
      "useNuGetCache": false
    }
  },
  "codeGenerators": {
    "swaggerToTypeScriptClient": {
      "className": "{controller}Client",
      "moduleName": "",
      "namespace": "",
      "typeScriptVersion": 2.7,
      "template": "Fetch",
      "promiseType": "Promise",
      "httpClass": "Http",
      "useSingletonProvider": false,
      "injectionTokenType": "OpaqueToken",
      "rxJsVersion": 5.0,
      "dateTimeType": "MomentJS",
      "nullValue": "Undefined",
      "generateClientClasses": true,
      "generateClientInterfaces": false,
      "generateOptionalParameters": false,
      "exportTypes": true,
      "wrapDtoExceptions": false,
      "clientBaseClass": null,
      "wrapResponses": false,
      "wrapResponseMethods": [],
      "generateResponseClasses": true,
      "responseClass": "SwaggerResponse",
      "protectedMethods": [],
      "configurationClass": null,
      "useTransformOptionsMethod": false,
      "useTransformResultMethod": false,
      "generateDtoTypes": true,
      "operationGenerationMode": "MultipleClientsFromOperationId",
      "markOptionalProperties": false,
      "generateCloneMethod": false,
      "typeStyle": "Interface",
      "classTypes": [],
      "extendedClasses": [],
      "extensionCode": null,
      "generateDefaultValues": true,
      "excludedTypeNames": [],
      "handleReferences": false,
      "generateConstructorInterface": true,
      "convertConstructorInterfaceData": false,
      "importRequiredTypes": true,
      "useGetBaseUrlMethod": false,
      "baseUrlTokenName": "API_BASE_URL",
      "queryNullValue": "",
      "templateDirectory": null,
      "typeNameGeneratorType": null,
      "propertyNameGeneratorType": null,
      "enumNameGeneratorType": null,
      "serviceHost": null,
      "serviceSchemes": null,
      "output": "*****"
    }
  }
}

Let me know if you need any more information.

Thanks

[RicoSuter]

To me this looks more like a Swagger UI 3 bug (which is only bundled into nswag but an external project)

[cruiserkernan]

I forgot to mention that the same happens when using the api from the generated typescript clients.

Could it be a bug related to dotnet core 2.2?

[RicoSuter]

Not sure if this feature is already supported in the typescript/c# generators... what is the output for this operation?

[cruiserkernan]

This is the generated typscript for the controller.

update(ids: number[] | undefined): Promise<Item> {
        let url_ = this.baseUrl + "/api/item/update";
        url_ = url_.replace(/[?&]$/, "");
        
        const content_ = new FormData();  
        
        if (ids === null || ids === undefined)
            throw new Error("The parameter 'ids' cannot be null.");
        else
            content_.append("ids", ids.toString());

        let options_ = <RequestInit>{
                    body: content_,
                    method: "POST",
                    headers: {
                        "Accept": "application/json"
                    }
                };

                return this.http.fetch(url_, options_).then((_response: Response) => {
                    return this.processUpdate(_response);
                });
    }

[cslovell]

I'm having the same issue--when using curl to POST, it works, yet the swagger form (identical to the one posted above) generated by UseSwaggerUi3 does not pass the integer array. Wonder if there are any known workarounds.