C#•4mo ago

✅ Describing `object` response in swagger

Hey. I have an endpoint that returns an object that looks something like this.

public record Webhook(
    string Id,
    PayloadType Type,
    object Payload
);

public record Webhook(
    string Id,
    PayloadType Type,
    object Payload
);

where Payload can change depending on the enum value. In typescript or other languages, I'd represent this object as a union type, but since we don't have that in C#, I'd just like to describe the possibilities of this in my swagger documentation

6 Replies

Angius•4mo ago

First and foremost I'd use generics here, not object With Nswag you can use [KnownType] attribute, but IIRC it only works with derived types Not with the equivalent of any With generics, as I mentioned, you should be able to use the [Produces] attribute on the controller, though

[HttpGet]
[ProducesResponseType(typeof(Webhook<int>))]
[ProducesResponseType(typeof(Webhook<Person>))]
[ProducesResponseType(typeof(Webhook<string>))]
public async IActionResult GetWebhook()
{
    // ...
}

[HttpGet]
[ProducesResponseType(typeof(Webhook<int>))]
[ProducesResponseType(typeof(Webhook<Person>))]
[ProducesResponseType(typeof(Webhook<string>))]
public async IActionResult GetWebhook()
{
    // ...
}

Unknown User•4mo ago

Message Not Public

Angius•4mo ago

Ooh, you're right! You could do

Result<
    OkResult<Webhook<int>>,
    OkResult<Webhook<Person>>,
    OkResult<Webhook<string>>
>

Result<
    OkResult<Webhook<int>>,
    OkResult<Webhook<Person>>,
    OkResult<Webhook<string>>
>

as the return type

Unknown User•4mo ago

Message Not Public

Angius•4mo ago

Probably with a type alias lol

ægteemil•4mo ago

Ahhh, I'll give that a go. Thanks!

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✅ Describing `object` response in swagger