private async Task <ActionResult <PreReleaseAccessListViewModel> > GetViewModel(
string publicationSlug,
string?releaseSlug = null)
{
return(await _publicationService.Get(publicationSlug)
.OnSuccessCombineWith(_ => _releaseService.GetCachedRelease(publicationSlug, releaseSlug))
.OnSuccess(publicationAndRelease =>
{
var(publication, release) = publicationAndRelease;
return new PreReleaseAccessListViewModel(release !, publication);
})
.HandleFailuresOrOk());
}