'Schema reference path has not been resolved' in path referenced yaml file

[mwijns]

When generating C# client code with the NSwag command line toolchain 13.9.2 Netcore31 from

root.yaml:

openapi: 3.0.2
paths:
  /test:
    $ref: './path.yaml#/paths/test'

path.yaml:

paths:
  test:
    get:
      requestBody:
        content:
          application/json:
            schema:
              $ref: './object.yaml#/components/schemas/TestRequest'
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: './object.yaml#/components/schemas/TestResponse'

object.yaml

components:
  schemas:
    TestRequest:
      type: object
      properties:
        version:
          type: integer
    TestResponse:
      type: object
      properties:
        version:
          type: integer

I get the following error:

  System.InvalidOperationException: The schema reference path './object.yaml#/components/schemas/TestResponse' has not been resolved.
     at NJsonSchema.JsonSchema.GetActualSchema(IList`1 checkedSchemas)
     at NJsonSchema.JsonSchema.get_ActualSchema()
     at NSwag.CodeGeneration.Models.ResponseModelBase..ctor(IOperationModel operationModel, OpenApiOperation operation, String statusCode, OpenApiResponse response, Boolean isPrimarySuccessResponse, JsonSchema exceptionSchema, TypeResolverBase resolver, CodeGeneratorSettingsBase settings, IClientGenerator generator) in C:\projects\nswag\src\NSwag.CodeGeneration\Models\ResponseModelBase.cs:line 52
     at NSwag.CodeGeneration.CSharp.Models.CSharpResponseModel..ctor(IOperationModel operationModel, OpenApiOperation operation, String statusCode, OpenApiResponse response, Boolean isPrimarySuccessResponse, JsonSchema exceptionSchema, IClientGenerator generator, TypeResolverBase resolver, CodeGeneratorSettingsBase settings) in C:\projects\nswag\src\NSwag.CodeGeneration.CSharp\Models\CSharpResponseModel.cs:line 32
     at NSwag.CodeGeneration.CSharp.Models.CSharpOperationModel.CreateResponseModel(OpenApiOperation operation, String statusCode, OpenApiResponse response, JsonSchema exceptionSchema, IClientGenerator generator, TypeResolverBase resolver, ClientGeneratorBaseSettings settings) in C:\projects\nswag\src\NSwag.CodeGeneration.CSharp\Models\CSharpOperationModel.cs:line 291
     at NSwag.CodeGeneration.Models.OperationModelBase`2.<>c__DisplayClass4_0.<.ctor>b__0(KeyValuePair`2 response) in C:\projects\nswag\src\NSwag.CodeGeneration\Models\OperationModelBase.cs:line 41
     at System.Linq.Enumerable.SelectEnumerableIterator`2.ToList()
     at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
     at NSwag.CodeGeneration.Models.OperationModelBase`2..ctor(JsonSchema exceptionSchema, OpenApiOperation operation, TypeResolverBase resolver, IClientGenerator generator, ClientGeneratorBaseSettings settings) in C:\projects\nswag\src\NSwag.CodeGeneration\Models\OperationModelBase.cs:line 40
     at NSwag.CodeGeneration.CSharp.Models.CSharpOperationModel..ctor(OpenApiOperation operation, CSharpGeneratorBaseSettings settings, CSharpGeneratorBase generator, CSharpTypeResolver resolver) in C:\projects\nswag\src\NSwag.CodeGeneration.CSharp\Models\CSharpOperationModel.cs:line 46
     at NSwag.CodeGeneration.CSharp.CSharpClientGenerator.CreateOperationModel(OpenApiOperation operation, ClientGeneratorBaseSettings settings) in C:\projects\nswag\src\NSwag.CodeGeneration.CSharp\CSharpClientGenerator.cs:line 78
     at NSwag.CodeGeneration.ClientGeneratorBase`3.<>c__DisplayClass16_0.<GetOperations>b__1(<>f__AnonymousType0`3 tuple) in C:\projects\nswag\src\NSwag.CodeGeneration\ClientGeneratorBase.cs:line 163
     at System.Linq.Enumerable.SelectEnumerableIterator`2.ToList()
     at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
     at NSwag.CodeGeneration.ClientGeneratorBase`3.GetOperations(OpenApiDocument document) in C:\projects\nswag\src\NSwag.CodeGeneration\ClientGeneratorBase.cs:line 152
     at NSwag.CodeGeneration.ClientGeneratorBase`3.GenerateAllClientTypes() in C:\projects\nswag\src\NSwag.CodeGeneration\ClientGeneratorBase.cs:line 106
     at NSwag.CodeGeneration.ClientGeneratorBase`3.GenerateFile(ClientGeneratorOutputType outputType) in C:\projects\nswag\src\NSwag.CodeGeneration\ClientGeneratorBase.cs:line 73
     at NSwag.Commands.CodeGeneration.SwaggerToCSharpClientCommand.GenerateContracts(Dictionary`2 result, CSharpClientGenerator clientGenerator) in C:\projects\nswag\src\NSwag.Commands\Commands\CodeGeneration\OpenApiToCSharpClientCommand.cs:line 286
     at NSwag.Commands.CodeGeneration.SwaggerToCSharpClientCommand.<RunAsync>b__92_0() in C:\projects\nswag\src\NSwag.Commands\Commands\CodeGeneration\OpenApiToCSharpClientCommand.cs:line 260
     at NSwag.Commands.CodeGeneration.SwaggerToCSharpClientCommand.RunAsync() in C:\projects\nswag\src\NSwag.Commands\Commands\CodeGeneration\OpenApiToCSharpClientCommand.cs:line 251
     at NSwag.Commands.CodeGeneration.SwaggerToCSharpClientCommand.RunAsync(CommandLineProcessor processor, IConsoleHost host) in C:\projects\nswag\src\NSwag.Commands\Commands\CodeGeneration\OpenApiToCSharpClientCommand.cs:line 240
     at NSwag.Commands.NSwagDocument.ExecuteAsync() in C:\projects\nswag\src\NSwag.Commands\NSwagDocument.cs:line 85
     at NSwag.Commands.Document.ExecuteDocumentCommand.ExecuteDocumentAsync(IConsoleHost host, String filePath) in C:\projects\nswag\src\NSwag.Commands\Commands\Document\ExecuteDocumentCommand.cs:line 86
     at NSwag.Commands.Document.ExecuteDocumentCommand.RunAsync(CommandLineProcessor processor, IConsoleHost host) in C:\projects\nswag\src\NSwag.Commands\Commands\Document\ExecuteDocumentCommand.cs:line 32
     at NConsole.CommandLineProcessor.ProcessSingleAsync(String[] args, Object input)
     at NConsole.CommandLineProcessor.ProcessAsync(String[] args, Object input)
     at NConsole.CommandLineProcessor.Process(String[] args, Object input)
     at NSwag.Commands.NSwagCommandProcessor.Process(String[] args) in C:\projects\nswag\src\NSwag.Commands\NSwagCommandProcessor.cs:line 56

I saw that path reference support was added recently (#1953). When recreating the same case in ExternalReferenceTests.cs / path-reference.json no error is given.
When generating from the same files with the 13.6.0 toolchain no error is given and the code is correctly generated.

[goldsam]

Any update to this?

[mwijns]

I stuck to the 13.6.x version and haven't tried it with a more recent version lately.

[RicoSuter]

I have the feeling this might have been fixed with this PR:
RicoSuter/NJsonSchema#1317

Please try again with v13.10.4+

[roelofvdv]

I get the exact same issue when trying to generate a C# client based on a public Swagger 2.0 yaml specification.
This is the spec: https://dev.float.com/swagger-api-v3.yaml

I'm using version 13.11.3 of the Nuget packages NSwag.CodeGeneration.CSharp and NSwag.Core.Yaml

    static async Task Main(string[] args)
    {
        const string endpoint = "https://dev.float.com/swagger-api-v3.yaml";

        var document = await OpenApiYamlDocument.FromUrlAsync(endpoint);
        var settings = new CSharpClientGeneratorSettings
        {
            ClassName = "MyClass",
            CSharpGeneratorSettings =
            {
                Namespace = "MyNamespace",
            }
        };

        var generator = new CSharpClientGenerator(document, settings);
        var code = generator.GenerateFile();
    }

Exception has occurred: CLR/System.InvalidOperationException
An exception of type 'System.InvalidOperationException' occurred in NJsonSchema.dll but was not handled in user code: 'The schema reference path '#/definitions/ReportsPeople' has not been resolved.'
at NJsonSchema.JsonSchema.GetActualSchema(IList1 checkedSchemas) at NJsonSchema.JsonSchema.get_ActualSchema() at NSwag.OpenApiDocument.<>c.<GenerateOperationIds>b__63_3(KeyValuePair2 r)
at System.Linq.Enumerable.Any[TSource](IEnumerable1 source, Func2 predicate)
at NSwag.OpenApiDocument.<>c.b__63_2(OpenApiOperationDescription o)
at System.Linq.Enumerable.TryGetFirst[TSource](IEnumerable1 source, Func2 predicate, Boolean& found)
at NSwag.OpenApiDocument.GenerateOperationIds()
at NSwag.CodeGeneration.ClientGeneratorBase3.GetOperations(OpenApiDocument document) at NSwag.CodeGeneration.ClientGeneratorBase3.GenerateAllClientTypes()
at NSwag.CodeGeneration.ClientGeneratorBase3.GenerateFile(ClientGeneratorOutputType outputType) at NSwag.CodeGeneration.ClientGeneratorBase3.GenerateFile()
at NSwagClientGenerator.Program.

d__0.MoveNext() in C:\Users\Roelof\source\repos\fiddles\NSwagClientGenerator\Program.cs:line 26

Any help would be appreciated

[VusalDev]

Same issue with 13.20.0.
Generate client/controller from someapi.yaml, which $ref schema from ./includes/common.yaml, which $ref schema from itself.

System.InvalidOperationException: The schema reference path './common.yaml#/components/schemas/NanoId' has not been resolved.

[xamele0n]

I`ve found that external references works only for section #/definitions
If you have document A.yaml referencing document B.yaml it loads B as JsonSchema document (not OpenAPI document). Then JsonSchema search references in /definitions section.

First reference from A to B works well, but all other references in B must point to #/definitions section (https://json-schema.org/draft-07/schema#)