Status:

Install package : https://www.nuget.org/packages/PolymorphicContracts.TypeDiscriminatorSwaggerSetup.

• Clone locally this github repository
• Build the PolymorphicContracts.TypeDiscriminatorSwaggerSetup.csproj project

Sample project example

In your ASP.NET Core 7 project choose assemblies, that contains hierarchies marked with JsonDerivedTypeAttribute.

List them in appsettings.json files as follows:

{
  //... your config
  "JsonHierarchies": {
    "Assemblies": [
      "PolymorphicContracts.Models"
    ]
  }
}

Then, while configuring services, after adding SwaggerGen call special extension:

builder.Services.AddTypeDiscriminatorToSwagger(builder.Configuration);

1. Use same discriminator type. Whether it's all string, whether it's all int.
2. Hierarchy root type must be abstract record or abstract class.
3. Hierarchy must be "flat", i.e. you inherit only hierarchy root.

Wrong hierarchy example, breaking all rules:

[JsonDerivedType(typeof(DerivedFirst), typeDiscriminator: 1)]
[JsonDerivedType(typeof(DerivedSecond), typeDiscriminator: "2")]
interface IBase
{
}

record DerivedFirst : IBase;

record DerivedSecond : DerivedFirst;

Status:

Install package : https://www.nuget.org/packages/PolymorphicContracts.AutoFixture.

• Clone locally this github repository
• Build the PolymorphicContracts.AutoFixture.csproj project

Let's say you have an hierarchy like this:

abstract class A { }
class B : A { }
class C : A { }

And you want call fixture to create instance of any random derived type like this:

fixture.Create<A>(); // B or C

Then you can use this package like this:

fixture.CustomizePolymorphism<A>()
    .WithDerivedType<B>()
    .WithDerivedType<C>()
    .BuildCustomization();