Невозможно сериализовать тип: «Продукт», поскольку для свойства дискриминатора нет зарегистрированного сопоставления. ⇐ C#

[Anonymous]

У меня есть базовый класс Product, который использует свойство дискриминатора для различения различных типов продуктов. Я также использую AutoMapper для сопоставления DTO и этих полиморфных типов. Однако во время выполнения я столкнулся со следующей ошибкой:

для свойства дискриминатора не зарегистрировано сопоставление

fail: Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware[1]
An unhandled exception has occurred while executing the request.
Newtonsoft.Json.JsonSerializationException: Impossible to serialize type: ecommerce.Domain.Model.Product because there is no registered mapping for the discriminator property
at JsonSubTypes.JsonSubtypesByDiscriminatorValueConverter.WriteJson(JsonWriter writer, Object value, JsonSerializer serializer)
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeConvertable(JsonWriter writer, JsonConverter converter, Object value, JsonContract contract, JsonContainerContract collectionContract, JsonProperty containerProperty)
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer, Object value, JsonContract valueContract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty)
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.Serialize(JsonWriter jsonWriter, Object value, Type objectType)
at Newtonsoft.Json.JsonSerializer.SerializeInternal(JsonWriter jsonWriter, Object value, Type objectType)
at Newtonsoft.Json.JsonSerializer.Serialize(JsonWriter jsonWriter, Object value)
at Microsoft.AspNetCore.Mvc.Formatters.NewtonsoftJsonOutputFormatter.WriteResponseBodyAsync(OutputFormatterWriteContext context, Encoding selectedEncoding)
at Microsoft.AspNetCore.Mvc.Formatters.NewtonsoftJsonOutputFormatter.WriteResponseBodyAsync(OutputFormatterWriteContext context, Encoding selectedEncoding)
at Microsoft.AspNetCore.Mvc.Formatters.NewtonsoftJsonOutputFormatter.WriteResponseBodyAsync(OutputFormatterWriteContext context, Encoding selectedEncoding)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|30_0[TFilter,TFilterAsync](ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResultExecutedContextSealed context)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.ResultNext[TFilter,TFilterAsync](State& next, Scope& scope, Object& state, Boolean& isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeResultFilters()
--- End of stack trace from previous location ---
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|20_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
at Swashbuckle.AspNetCore.SwaggerUI.SwaggerUIMiddleware.Invoke(HttpContext httpContext)
at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.Invoke(HttpContext httpContext, ISwaggerProvider swaggerProvider)
at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddlewareImpl.g__Awaited|10_0(ExceptionHandlerMiddlewareImpl middleware, HttpContext context, Task task)
fail: ecommerce.Exceptions.GeneralExceptionHandler[0]
Something went wrong..
Newtonsoft.Json.JsonSerializationException: Impossible to serialize type: ecommerce.Domain.Model.Product because there is no registered mapping for the discriminator property
at JsonSubTypes.JsonSubtypesByDiscriminatorValueConverter.WriteJson(JsonWriter writer, Object value, JsonSerializer serializer)
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeConvertable(JsonWriter writer, JsonConverter converter, Object value, JsonContract contract, JsonContainerContract collectionContract, JsonProperty containerProperty)
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer, Object value, JsonContract valueContract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty)
at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.Serialize(JsonWriter jsonWriter, Object value, Type objectType)
at Newtonsoft.Json.JsonSerializer.SerializeInternal(JsonWriter jsonWriter, Object value, Type objectType)
at Newtonsoft.Json.JsonSerializer.Serialize(JsonWriter jsonWriter, Object value)
at Microsoft.AspNetCore.Mvc.Formatters.NewtonsoftJsonOutputFormatter.WriteResponseBodyAsync(OutputFormatterWriteContext context, Encoding selectedEncoding)
at Microsoft.AspNetCore.Mvc.Formatters.NewtonsoftJsonOutputFormatter.WriteResponseBodyAsync(OutputFormatterWriteContext context, Encoding selectedEncoding)
at Microsoft.AspNetCore.Mvc.Formatters.NewtonsoftJsonOutputFormatter.WriteResponseBodyAsync(OutputFormatterWriteContext context, Encoding selectedEncoding)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|30_0[TFilter,TFilterAsync](ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResultExecutedContextSealed context)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.ResultNext[TFilter,TFilterAsync](State& next, Scope& scope, Object& state, Boolean& isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeResultFilters()
--- End of stack trace from previous location ---
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|20_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
at Swashbuckle.AspNetCore.SwaggerUI.SwaggerUIMiddleware.Invoke(HttpContext httpContext)
at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.Invoke(HttpContext httpContext, ISwaggerProvider swaggerProvider)
at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddlewareImpl.g__Awaited|10_0(ExceptionHandlerMiddlewareImpl middleware, HttpContext context, Task task)

Код:
// Configure services
builder.Services.AddControllers()
.AddNewtonsoftJson(options =>
{
options.SerializerSettings.ReferenceLoopHandling =
Newtonsoft.Json.ReferenceLoopHandling.Ignore;

options.SerializerSettings.Converters.Add(
JsonSubtypesConverterBuilder
.Of(typeof(Product), "ProductTypeId")
.RegisterSubtype(typeof(Type1), 1)
.RegisterSubtype(typeof(Type2), 2)
.RegisterSubtype(typeof(Type3), 3)
.RegisterSubtype(typeof(Type4), 4)
.SerializeDiscriminatorProperty()
.Build()
);
});
builder.Services.AddSwaggerGen(options =>
{
//features of Polymorphism to the swagger
options.SwaggerDoc("v1", new OpenApiInfo);
options.UseAllOfToExtendReferenceSchemas();
options.UseAllOfForInheritance();
options.UseOneOfForPolymorphism();
options.SelectDiscriminatorNameUsing(type =>
{
return type.Name switch
{
nameof(Product) => "ProductTypeId",
_ => null
};
});

// Base class for products
public abstract class Product
{
public int ProductId { get; set; }
public string Name { get; set; }
public ProductType ProductTypeId { get; set; }
public decimal Price { get; set; }
}

// Subtype class Type1
public class Type1 : Product
{
public string SpecificProperty1 { get; set; }
public int SpecificProperty2 { get; set; }
}

public class Type2 : Product
{
....
}

public class ProductType
{
public int ProductTypeId { get; set; }
public int DepartmentId { get; set; }
public string ProductTypeName { get; set; }
public virtual Department? Department { get; set; }

}

public class ProductTypeDTO
{
public int ProductTypeId { get; set; }
public int DepartmentId { get; set; }
public string ProductTypeName { get; set; }


Когда я удаляю ProductDTO и использую сущность Product непосредственно в репозитории, в методе CreateProductAsync все работает отлично
public async Task CreateProductAsync(ProductDTO productDto)
{
Product productType;

switch (productDto)
{
case Type1 type1Dto:
productType = _mapper.Map(type1Dto);
break;
case Type2 type2Dto:
productType = _mapper.Map(type2Dto);
break;
case Type3 type3Dto:
productType = _mapper.Map(type3Dto);
break;
default:
productType = _mapper.Map(productDto);
break;
}

var addedProductType = await _productRepository.AddAsync(productType);
return addedProductType;
}


Подробнее здесь: https://stackoverflow.com/questions/790 ... -mapping-f