UnboundOperation throws an exception

[mihai-stancescu]

If you create an [UnboundOperation] (by the way Operation is not working as it's shown in the documentation.) and you have one or 2 strings as parameters you will get this exception:

System.InvalidCastException: Unable to cast object of type 'Microsoft.OData.Edm.EdmPrimitiveTypeReference' to type 'Microsoft.OData.Edm.IEdmStringTypeReference'.
  at Microsoft.OpenApi.OData.Generator.OpenApiEdmTypeSchemaGenerator.CreateSchema(ODataContext context, IEdmPrimitiveTypeReference primitiveType)
  at Microsoft.OpenApi.OData.Generator.OpenApiEdmTypeSchemaGenerator.CreateEdmTypeSchema(ODataContext context, IEdmTypeReference edmTypeReference)
  at Microsoft.OpenApi.OData.Generator.OpenApiParameterGenerator.CreateParameters(ODataContext context, IEdmFunction function, IDictionary`2 parameterNameMapping)
  at Microsoft.OpenApi.OData.Generator.OpenApiParameterGenerator.CreateParameters(ODataContext context, IEdmFunctionImport functionImport)
  at Microsoft.OpenApi.OData.Operation.EdmFunctionImportOperationHandler.SetParameters(OpenApiOperation operation)
  at Microsoft.OpenApi.OData.Operation.OperationHandler.CreateOperation(ODataContext context, ODataPath path)
  at Microsoft.OpenApi.OData.PathItem.PathItemHandler.AddOperation(OpenApiPathItem item, OperationType operationType)
  at Microsoft.OpenApi.OData.PathItem.OperationImportPathItemHandler.SetOperations(OpenApiPathItem item)
  at Microsoft.OpenApi.OData.PathItem.PathItemHandler.CreatePathItem(ODataContext context, ODataPath path)
  at Microsoft.OpenApi.OData.Generator.OpenApiPathItemGenerator.CreatePathItems(ODataContext context)
  at Microsoft.OpenApi.OData.Generator.OpenApiPathsGenerator.CreatePaths(ODataContext context)
  at Microsoft.OpenApi.OData.Generator.OpenApiDocumentGenerator.CreateDocument(ODataContext context)
  at Microsoft.OpenApi.OData.EdmModelOpenApiExtensions.ConvertToOpenApi(IEdmModel model, OpenApiConvertSettings settings)
  at Microsoft.Restier.AspNetCore.Swagger.RestierSwaggerProvider.GetSwagger(String documentName, String host, String basePath)\r\n   at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.Invoke(HttpContext httpContext, ISwaggerProvider swaggerProvider)
  at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
  at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
  at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddlewareImpl.<Invoke>g__Awaited|10_0(ExceptionHandlerMiddlewareImpl middleware, HttpContext context, Task task)

This only happens for the Swagger generation. The actual queries works fine.

Assemblies affected

Microsoft.Restier.AspNetCore Version="1.1.1"
Microsoft.Restier.AspNetCore.Swagger Version="1.1.1"
Microsoft.Restier.Core Version="1.1.1"
Microsoft.Restier.EntityFrameworkCore Version="1.1.1"
Swashbuckle.AspNetCore Version="6.6.2"
Swashbuckle.AspNetCore.SwaggerGen Version="6.6.2"
Swashbuckle.AspNetCore.SwaggerUI Version="6.6.2"

Reproduce steps

As said in this comment: Issue #720

Expected result

Correctly generate the OpenApi json and Swagger UI.

Actual result

An exception is thrown when accessing the Swagger endpoint.

Additional details

If I make them BoundOperation the error goes away but they are completely ignored in Swagger.

Any thoughts?
Thank you!

[cilerler]

Important

Please provide a minimal repository that reproduces the issue.

I am using .NET Core 8 with Restier 1.1.1, and Swagger is working correctly.

Some signatures I have...

[Microsoft.Restier.AspNetCore.Model.UnboundOperation]
public IQueryable<EmailAddress> GetEmailsToValidate()
{
	// ...
	return query.AsQueryable();
}

[Microsoft.Restier.AspNetCore.Model.UnboundOperation]
public async Task<bool> ValidateBulkAsync()
{
	// ...
	return isFinalRecord;
}

[mihai-stancescu]

You need to add string parameters to the operations.

[cilerler]

You can not. You have to define it as ComplexType.
Here is a workaround.

[Microsoft.Restier.AspNetCore.Model.UnboundOperation(OperationType = Microsoft.Restier.AspNetCore.Model.OperationType.Action)]
public IQueryable<EmailAddress> GetEmailsToValidate(StringRequest input)
{
	// ...
	return query.AsQueryable();
}

public class CustomModelExtender : IModelBuilder
{
    public IModelBuilder InnerHandler { get; set; }

    public IEdmModel GetModel(ModelContext context)
    {
	    IEdmModel model = InnerHandler.GetModel(context);
    
	    var modelBuilder = new ODataConventionModelBuilder();
	    modelBuilder.ComplexType<StringResponse>();
    
	    return modelBuilder.GetEdmModel();
    }
}

public class StringRequest
{
	public string Value { get; set; }
}

public static IHostApplicationBuilder AddRestierInternal(this IHostApplicationBuilder builder)
{
          builder.Services.AddRestier(b =>
		          {
			          // This delegate is executed after OData is added to the container.
			          b.AddRestierApi<ApiController>(routeServices =>
			          {
			              // ...
                                      routeServices.AddChainedService<IModelBuilder, CustomModelExtender>();
                                      // ...
			          }
		          });
}

[mihai-stancescu]

Hello,
Thank you for your answer!
It's working now.
One quick question, do you happen to have an example of how to call the function? The url for it?

This is how I'm calling it:

https://localhost:8762/odata/GetEmailsToValidate(input =@ input)?@ input ={"Value":"test"}

And when I do, I get this exception:

{
    "error": {
        "code": "",
        "message": "Value cannot be null. (Parameter 's')",
        "details": [],
        "innererror": {
            "message": "Value cannot be null. (Parameter 's')",
            "type": "System.ArgumentNullException",
            "stacktrace": "   at void ArgumentNullException.Throw(string paramName)\r\n   at byte[] System.Text.Encoding.GetBytes(string s)\r\n   at object Microsoft.AspNet.OData.Formatter.ODataModelBinderConverter.ConvertResourceOrResourceSet(object oDataValue, IEdmTypeReference edmTypeReference, ODataDeserializerContext readContext)\r\n   at object Microsoft.AspNet.OData.Formatter.ODataModelBinderConverter.Convert(object graph, IEdmTypeReference edmTypeReference, Type clrType, string parameterName, ODataDeserializerContext readContext, IServiceProvider requestContainer)\r\n   at object Microsoft.Restier.AspNetCore.Formatter.DeserializationHelpers.ConvertValue(object odataValue, string parameterName, Type expectedReturnType, IEdmTypeReference propertyType, IEdmModel model, HttpRequest request, IServiceProvider serviceProvider)\r\n   at async Task<IQueryable> Microsoft.Restier.AspNetCore.Operation.RestierOperationExecutor.ExecuteOperationAsync(OperationContext context, CancellationToken cancellationToken)\r\n   at async Task<IActionResult> Microsoft.Restier.AspNetCore.RestierController.Get(CancellationToken cancellationToken)\r\n   at async ValueTask<IActionResult> Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor+TaskOfIActionResultExecutor.Execute(ActionContext actionContext, IActionResultTypeMapper mapper, ObjectMethodExecutor executor, object controller, object[] arguments)\r\n   at async Task Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeActionMethodAsync()+Awaited(?)\r\n   at async Task Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeNextActionFilterAsync()+Awaited(?)\r\n   at void Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)\r\n   at Task Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)\r\n   at Task Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()\r\n   at async Task Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeNextExceptionFilterAsync()+Awaited(?)"
        }
    }
}

Thanks!

[cilerler]

To test the endpoint, use a POST request.

For VSCode RestClient or Visual Studio Rest Client:
You can create a .http file then copy and paste the following text:

###
# @name GetEmailsToValidate
POST {{baseUrl}}/odata/GetEmailsToValidate HTTP/1.1
Content-Type: application/json
Cache-Control: no-cache

{
  "input": {
    "@odata.type": "#MyCompany.MyModels.Dto.Request.StringRequest",  // <== correct this checking it from the `/odata/$metadata`
    "Value": "me@test.local"
  }
}

You may need to adjust the formatting accordingly for Postman or other tools

[mihai-stancescu]

Thanks, thats for an Action, for a function with GET?
I've tried adding type annotation in the request, same error.
If I put them as string type, everything works ok, except Swagger.

[cilerler]

A simple GET request is unlikely to work because it requires @odata.type and an explicit declaration of the object name. On the client side, if you are using ODataClient, it handles these details automatically and uses a POST request based on the cases I've observed.

[mihai-stancescu]

Oh, ok, thanks!
I'll try with ODataClient from the Angular App. I've tried POST, I got Method not allowed. I'm adding the @odata.type, not really sure on the "explicit declaration of the object" though.

I'll try that and come back with results.
Thank you so much for the assistance so far!

[mihai-stancescu]

No matter how I try to call this function with the String Parameter is not working, even with the ODataClient.

[cilerler]

1. Update the part below.

Important

{
  "input": { <== update this
    "@odata.type": "#MyCompany.MyModels.Dto.Request.StringRequest",  // <== correct this checking it from the `/odata/$metadata`
    "Value": "me@test.local"
  }
}

2. Make sure your HTTP request is working first and then try it from the application.