How to register IRequestPostProcessor in 12.1.X

[callenj]

First i apologize if this is a basic thing, but i have tried to find an example and have tested a few different ways to register to no avail. Have read the docs a few times and nothing i try seems to work. Prior to 12.1, this worked fine with automatic registration via scanning. I understand that from 12.1 on, manual registration is required for Pre/Post processors.

I have a LoginQuery with this signature:
public record LoginQuery( string Username, string Password) : ILoginQuery, IRequest<ErrorOr<LoginQueryResult>>;

I want my post processor to trigger only for these specific queries (requests). My IRequestPostProcessor signature is:
public class LoginQueryPostProcessor<TRequest, TResponse> : IRequestPostProcessor<TRequest, TResponse> where TRequest : ILoginQuery where TResponse : IErrorOr

I have tried a few ways to register this, but the post processor is never called when using 12.1.X. Any examples or advise would be very much appreciated.

[jbogard]

How did you register the post processor? That looks like an open post processor so it should be:

cfg.AddOpenRequestPostProcessor(typeof(LoginQueryPostProcessor<,>));

[callenj]

Thank you so much Jimmy. That worked. I guess i did not read the docs carefully enough. I did not try the "Open" method. (AddOpenRequestPostProcessor). Really appreciate your work and help. Happy Friday.

[jbogard]

Probably could use better messages around that.

[cheng93]

@jbogard

after moving MediatR.Extensions.Microsoft.DependencyInjection into this repository.

It does feel like this is a breaking change should of probably gone to 13?

[seruminar]

@jbogard Agree with @cheng93, without carefully reading the notes and/or having a thorough dependency testing, it is possible to miss that IRequestPreProcessor implementations are no longer automatically registered. This was absolutely a breaking change and not a minor release. If this was requested by someone, perhaps it would help ease into the new API by having an opt-out feature for scanned registrations.